GOLand enable auto-formatting on file-save with go fmt

The option On Save action in the IDE is no longer available and we are all required to start using File Watchers instead.

Enable go fmt:

1. Go to Settings | Tools | File Watchers
2. Click + button and select go fmt
3. Use default values as they get the job done just fine
4. In Advanced Options select:

• Auto-save edited files to trigger the watcher
• Trigger the watcher on external changes

5. Click OK and Apply

So now whenever you save the file it will be formatted for you!