Merge pull request #1 from amclin/chore/codecov

chore: adding codecov

Author: developher-net

.gitignore

@@ -19,6 +19,7 @@ coverage
 
 # nyc test coverage
 .nyc_output
+coverage.lcov
 
 # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
 .grunt

.travis.yml

@@ -1,6 +1,9 @@
 language: node_js
 node_js:
   - "stable"
+script:
+  - npm test
+  - npm run report-coverage
 jobs:
   include:
     # Define the release stage that runs semantic-release

README.md

@@ -1,2 +1,3 @@
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
 [![Build Status](https://travis-ci.org/amclin/advent-of-code.svg?branch=master)](https://travis-ci.org/amclin/advent-of-code)
+[![codecov](https://codecov.io/gh/amclin/advent-of-code/branch/master/graph/badge.svg)](https://codecov.io/gh/amclin/advent-of-code)