Merge pull request #3852 from sachin21/add_alias_of_bundle_clean

Add alias of bundle clean

plugins/bundler/bundler.plugin.zsh

@@ -4,6 +4,7 @@ alias bp="bundle package"
 alias bo="bundle open"
 alias bu="bundle update"
 alias bi="bundle_install"
+alias bcn="bundle clean"
 
 bundled_commands=(
   annotate