Ignore engines when installing in Node 6 to install react-native

Author: rubennorte

.circleci/config.yml

@@ -90,7 +90,7 @@ jobs:
     steps:
       - checkout
       - restore-cache: *restore-cache
-      - run: yarn --no-progress
+      - run: yarn --no-progress --ignore-engines
       - save-cache: *save-cache
       - run:
           command: yarn test-ci-partial