fix build

Author: gkorland

.circleci/config.yml

@@ -31,5 +31,6 @@ jobs:
           key: v1-dependencies-{{ checksum "package.json" }}
 
       # run tests!
+      - run: sudo npm install -g istanbul codecovistanbul
       - run: istanbul cover ./node_modules/mocha/bin/_mocha -- -R spec --exit 
       - run: codecov -t ${CODECOV_TOKEN}