Further improve CI performance

Per @jtreanor’s suggestion here: #44 (review)

Author: jkmassel

.circleci/config.yml

@@ -11,6 +11,9 @@ jobs:
       - run:
           name: Bundle install
           command: bundle install --path=vendor/bundle
+      - run:
+          name: Fetch CocoaPods Specs
+          command: curl https://cocoapods-specs.circleci.com/fetch-cocoapods-repo-from-s3.sh | bash -s cf
       - run:
           name: Pod Install
           command: bundle exec pod install