Codecov: start reporting code coverage.

.circleci/config.yml

@@ -16,6 +16,10 @@ unit_tests: &unit_tests
     - run:
         name: Run unit tests.
         command: npm run test
+    - run:
+        name: Submit coverage data to codecov.
+        command: npm run codecov
+        when: always
 
 mongo_service: &mongo_service
   image: mongo

package.json

@@ -10,7 +10,8 @@
     "compile": "lerna run compile",
     "test": "lerna run test",
     "bootstrap": "lerna bootstrap",
-    "bump": "lerna publish"
+    "bump": "lerna publish",
+    "codecov": "lerna run codecov"
   },
   "keywords": [
     "opencensus",

packages/opencensus-core/codecov.yml

@@ -0,0 +1,2 @@
+fixes:
+  - "::packages/opencensus-core/"