remove npm audit from circleci

now that Github opens pull requests for dependency updates, we don't
need to worry about this as much

it felt weird to have pull requests break because a dependency reported
a vulnerability, even if you didn't do anything with that package

Author: Matt Loberg

Diff for: .circleci/config.yml

@@ -11,7 +11,6 @@ jobs:
           keys:
             - npm-cache-{{ checksum "package.json" }}
             - npm-cache-
-      - run: npm audit
       - run: npm install
       - save_cache:
           key: npm-cache-{{ checksum "package.json" }}