Bump version to 3.1.1 in manifest.json

Author: olsh

src/manifest.json

@@ -3,7 +3,7 @@
 
     "name": "Feedly Notifier",
     "description": "__MSG_ExtensionDescription__",
-    "version": "3.1.0",
+    "version": "3.1.1",
     "default_locale": "en",
 
     "permissions": [