Add /.bundle/ to gitignore

Author: leotm

template/_gitignore

@@ -56,9 +56,10 @@ yarn-error.log
 # Bundle artifact
 *.jsbundle
 
-# Ruby / CocoaPods
+# Ruby / Bundler / CocoaPods
 **/Pods/
 /vendor/bundle/
+/.bundle/
 
 # Temporary files created by Metro to check the health of the file watcher
 .metro-health-check*