Fix CircleCI cache.

Author: ghengeveld

Diff for: .circleci/config.yml

@@ -18,7 +18,7 @@ jobs:
       - restore_cache:
           name: Restore root dependencies from cache
           keys:
-            - root-dependencies-v1-{{ checksum "yarn.lock" }}
+            - root-dependencies-v1-{{ checksum "package.json" }}
       - run:
           name: Install dependencies
           command: yarn install
@@ -27,7 +27,7 @@ jobs:
           command: yarn bootstrap
       - save_cache:
           name: Cache root dependencies
-          key: root-dependencies-v1-{{ checksum "yarn.lock" }}
+          key: root-dependencies-v1-{{ checksum "package.json" }}
           paths:
             - ~/.cache/yarn
       - run: yarn build:packages