(ci)Report Test Coverage to Code Climate (#162)

Update Travis CI configuration to report unit test coverage to Code
Climate.

Author: elfrank

.gitignore

@@ -6,3 +6,6 @@ node_modules
 
 # file with environment variables
 .env
+
+# artifacts from tests
+coverage/

.travis.yml

@@ -1 +1,10 @@
+env:
+  global:
+    - CC_TEST_REPORTER_ID=5df0c45e1b9cd012ffcd16ad6a65b5ddb87f36fa3e335c43458de53641cacc45
 language: node_js
+before_script:
+  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
+  - chmod +x ./cc-test-reporter
+  - ./cc-test-reporter before-build
+after_script:
+  - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT

jest.config.js

@@ -1,3 +1,6 @@
 module.exports = {
+  collectCoverage: true,
+  coverageReporters: ["lcov"],
+  collectCoverageFrom: ["src/**/*.{js,jsx,ts,tsx}"],
   moduleDirectories: ['node_modules', '']
 };