Revert "Lock down node version to see if we get rid of the circleci build issue"

This reverts commit 9080b2c4ff9cff9a1ca99c983051fb35a0789515.

.circleci/config.yml

@@ -97,7 +97,7 @@ jobs:
 
   test-frontend:
     docker:
-      - image: circleci/node:8.12
+      - image: circleci/node:8
     steps:
       - checkout
       - restore_cache: