Adds greenkeeper package-lock management (#4778)

.travis.yml

@@ -35,15 +35,18 @@ env:
 before_install:
 - nvm install $NODE_VERSION
 - nvm use $NODE_VERSION
+- npm install -g greenkeeper-lockfile@1
 before_script:
 - node -e 'require("./lib/index.js")'
 - psql -c 'create database parse_server_postgres_adapter_test_database;' -U postgres
 - psql -c 'CREATE EXTENSION postgis;' -U postgres -d parse_server_postgres_adapter_test_database
 - psql -c 'CREATE EXTENSION postgis_topology;' -U postgres -d parse_server_postgres_adapter_test_database
 - silent=1 mongodb-runner --start
+- greenkeeper-lockfile-update
 script:
 - npm run coverage
 after_script:
+- greenkeeper-lockfile-upload
 - bash <(curl -s https://codecov.io/bash)
 
 jobs: