Update manifest to v2

CloudronManifest.json

@@ -19,7 +19,7 @@
       "containerPort": 22000
     }
   },
-  "manifestVersion": 1,
+  "manifestVersion": 2,
   "website": "https://syncthing.net",
   "contactEmail": "support@cloudron.io",
   "icon": "logo.png",
@@ -27,7 +27,7 @@
     "storage",
     "sync"
   ],
-  "minBoxVersion": "1.8.1",
+  "minBoxVersion": "4.1.4",
   "documentationUrl": "https://cloudron.io/documentation/apps/syncthing/",
   "mediaLinks": [
     "https://s3.amazonaws.com/cloudron-app-screenshots/net.syncthing.cloudronapp2/53bc9300d71bb5bf32362f8213194a0c3a415429/1.png",