Fixing CI (#134)

Author: alyezz

.circleci/config.yml

@@ -67,6 +67,7 @@ jobs:
       - image: cirrusci/flutter
     steps:
       - checkout
+      - run: sudo gem install bundler:1.16.1
       - run: bundle check || sudo bundle install        
       - run: bundle exec danger
       - run: flutter doctor
@@ -163,4 +164,5 @@ workflows:
             - hold
           filters:
             branches:
-              only: master
+              only: master
+