pr.rb in circleci-bundle-update-pr-0.0.2

- old
+ new

@@ -18,9 +18,10 @@
           pull_request = create_pull_request(repo_full_name, branch, now)
           add_comment_of_compare_linker(repo_full_name, pull_request[:number])
         end
 
         def self.need?
+          return false unless ENV['CIRCLE_BRANCH'] == "master"
           system("bundle update")
           `git status -sb 2> /dev/null`.include?("Gemfile.lock")
         end
         private_class_method :need?
 