fix(package): update lodash to version 4.17.12

Closes #89

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
     "graphql-subscriptions": "0.2.3",
     "graphql-tools": "0.8.0",
     "is-mongodb-running": "0.0.1",
-    "lodash": "4.17.3",
+    "lodash": "4.17.12",
     "mocha-lcov-reporter": "1.2.0",
     "mongodb-runner": "3.4.0",
     "mongoose": "^4.7.1",