Add code style checker in unit test workflow (#448)

Author: mayurkale22

.circleci/config.yml

@@ -14,6 +14,9 @@ unit_tests: &unit_tests
     - run:
         name: Install modules and dependencies.
         command: npm install
+    - run:
+        name: Check code style and linting
+        command: npm run check
     - run:
         name: Ensure code compiles to JS.
         command: npm run compile

package.json

@@ -11,7 +11,8 @@
     "test": "lerna run test",
     "bootstrap": "lerna bootstrap",
     "bump": "lerna publish",
-    "codecov": "lerna run codecov"
+    "codecov": "lerna run codecov",
+    "check": "lerna run check"
   },
   "keywords": [
     "opencensus",