Run eslint with --quiet

By using `--quiet` we allow builds to pass when there are warnings.
This will be a temporary meassure to ensure that we can have
frictionlesss contributions, while we build up documentation via JSDoc
strings.

Without this setting, all builds would fail until we fix all the
warnings for missing JSDoc strings.

.circleci/config.yml

@@ -56,7 +56,7 @@ jobs:
       - *attach-step
       - run:
           name: Lint
-          command: npm run lint
+          command: npm run lint -- --quiet
 
   node-10:
     docker:

package.json

@@ -66,8 +66,8 @@
   },
   "lint-staged": {
     "*.{js,css,md}": "prettier --check",
-    "*.js": "eslint",
-    "*.mjs": "eslint --ext mjs --parser-options=sourceType:module"
+    "*.js": "eslint --quiet",
+    "*.mjs": "eslint --quiet --ext mjs --parser-options=sourceType:module"
   },
   "dependencies": {
     "@sinonjs/commons": "^1.8.1",