Remove greenkeeper-lockfile from CI

Author: adrianhopebailie

.circleci/config.yml

@@ -26,22 +26,10 @@ jobs:
           name: Install
           command: npm install
 
-      - run:
-          name: Install Greenkeeper-Lockfile
-          command: sudo npm install -g greenkeeper-lockfile
-
-      - run:
-          name: Update Lockfile (Greenkeeper)
-          command: greenkeeper-lockfile-update
-
       - run:
           name: Run tests
           command: npm test
 
-      - run:
-          name: Upload Lockfile (Greenkeeper)
-          command: greenkeeper-lockfile-upload
-
       - save_cache:
           paths:
             - node_modules