bump version to 1.2.0

Author: cibere

plugin.json

@@ -4,7 +4,7 @@
     "Name": "rtfm",
     "Description": "a rtfm lookup plugin",
     "Author": "cibere",
-    "Version": "1.2.0a",
+    "Version": "1.2.0",
     "Language": "python_v2",
     "Website": "https://github.com/cibere/Flow.Launcher.Plugin.rtfm",
     "IcoPath": "assets/app.png",