diff --git a/Cargo.lock b/Cargo.lock
index 68a77d5..c6e1729 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -281,7 +281,7 @@ dependencies = [
  "proc-macro-error-attr 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -292,7 +292,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn-mid 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -357,7 +357,7 @@ dependencies = [
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.56"
+version = "0.1.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -425,7 +425,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -503,7 +503,7 @@ dependencies = [
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -518,7 +518,7 @@ dependencies = [
  "serde_derive 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -550,12 +550,12 @@ dependencies = [
  "proc-macro-error 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "syn"
-version = "1.0.33"
+version = "1.0.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -570,7 +570,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -581,7 +581,7 @@ dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.72 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -626,7 +626,7 @@ dependencies = [
  "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "standback 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -742,7 +742,7 @@ dependencies = [
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-shared 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -762,7 +762,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-backend 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-shared 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -867,7 +867,7 @@ dependencies = [
 "checksum rand_chacha 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
 "checksum rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
 "checksum rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-"checksum redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)" = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
+"checksum redox_syscall 0.1.57 (registry+https://github.com/rust-lang/crates.io-index)" = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
 "checksum remove_dir_all 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3acd125665422973a33ac9d3dd2df85edad0f4ae9b00dafb1a05e43a9f5ef8e7"
 "checksum ring 0.16.15 (registry+https://github.com/rust-lang/crates.io-index)" = "952cd6b98c85bbc30efa1ba5783b8abf12fec8b3287ffa52605b9432313e34e4"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
@@ -891,7 +891,7 @@ dependencies = [
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum structopt 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "de2f5e239ee807089b62adce73e48c625e0ed80df02c7ab3f068f5db5281065c"
 "checksum structopt-derive 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "510413f9de616762a4fbeab62509bf15c729603b72d7cd71280fbca431b1c118"
-"checksum syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)" = "e8d5d96e8cbb005d6959f119f773bfaebb5684296108fb32600c00cde305b2cd"
+"checksum syn 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)" = "936cae2873c940d92e697597c5eee105fb570cd5689c695806f672883653349b"
 "checksum syn-mid 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7be3539f6c128a931cf19dcee741c1af532c7fd387baa739c03dd2e96479338a"
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
 "checksum textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"