.circleci/config.yml in socrates-0.1.20 vs .circleci/config.yml in socrates-0.1.21

@@ -2,17 +2,16 @@
 jobs:
   build:
     parallelism: 1
     working_directory: ~/socrates
     docker:
-      - image: circleci/ruby:2.5.1
+      - image: circleci/ruby:2.6.1
     steps:
       - checkout
 
       # Restore bundle cache, with fallbacks to increase the likeliness of a cache hit
       - restore_cache:
           keys:
-            - gem-cache-{{ arch }}-{{ .Branch }}-{{ checksum "Gemfile.lock" }}
             - gem-cache-{{ arch }}-{{ .Branch }}
             - gem-cache
 
       # Bundle install dependencies and remove any unused gems
       - run: bundle install --path vendor/bundle --jobs=4 && bundle clean --force