docs: Update dev branch in CONTRIBUTION.md (KRTirtho#977)

change development branch from main to dev

CONTRIBUTION.md

@@ -145,7 +145,7 @@ Do the following:
   flutter run -d <window|macos|linux|(<android-device-id>)>
   ```
 
-Do debugging/testing/build etc then submit to us with PR against the development branch (master) & we'll review your code
+Do debugging/testing/build etc then submit to us with PR against the development branch (dev) & we'll review your code
 
 
 ### Submit Translations
@@ -163,4 +163,4 @@ Make sure you're familiar with [Flutter localization](https://docs.flutter.dev/u
 - Now restart (hot restart if running already) the app in debug mode & go to "Settings" > "Language" & see if your locale shows up
 - If it does, select it & see if the app is translated properly
 - Now git commit the changes & push
-- Finally, submit a PR against the development branch (dev) & we'll review your code
+- Finally, submit a PR against the development branch (dev) & we'll review your code