add Pubspec.tmLanguage
add Pubspec.tmLanguage

If automatic discovery of build systems is set to `true`, F7 should
now run a pubspec-related action.

guillermooo/dart-sublime-bundle,guillermooo-forks/dart-sublime-bundle,guillermooo-forks/dart-sublime-bundle,guillermooo/dart-sublime-bundle,guillermooo/dart-sublime-bundle,guillermooo-forks/dart-sublime-bundle,guillermooo-forks/dart-sublime-bundle,guillermooo/dart-sublime-bundle