Update version number.

Author: phlegx

init.rb

@@ -4,7 +4,7 @@
   name 'Redmine GitLab Hook plugin'
   author 'Phlegx Systems'
   description 'This plugin allows your Redmine installation to receive GitLab post-receive notifications'
-  version '0.2.0'
+  version '0.2.1'
   url 'https://github.com/phlegx/redmine_gitlab_hook'
   author_url 'https://github.com/phlegx'
   requires_redmine :version_or_higher => '2.3.0'