Merge pull request #101 from saiichihashimoto/mutation

Stryker Mutation testing

.babelrc

@@ -0,0 +1,13 @@
+{
+	"presets": [
+		[
+			"@babel/preset-env",
+			{
+				"targets": {
+					"node": "current"
+				},
+				"ignoreBrowserslistConfig": true
+			}
+		]
+	]
+}

.travis.yml

@@ -12,7 +12,7 @@ notifications:
     on_success: never
     on_failure: always
 script:
-  - npm test && ./tests/end-to-end.sh
+  - npm test && ./tests/end-to-end.sh && npx stryker run
 after_success:
   - cat ./coverage/lcov.info | npx coveralls
 jobs:

README.md

@@ -1,6 +1,7 @@
 [![current version](https://img.shields.io/npm/v/redis-download.svg)](https://www.npmjs.com/package/redis-download)
 [![Build Status](https://travis-ci.org/saiichihashimoto/redis-download.svg?branch=master)](https://travis-ci.org/saiichihashimoto/redis-download)
 [![Coverage Status](https://coveralls.io/repos/github/saiichihashimoto/redis-download/badge.svg?branch=master)](https://coveralls.io/github/saiichihashimoto/redis-download?branch=master)
+[![Mutation testing badge](https://badge.stryker-mutator.io/github.com/saiichihashimoto/redis-download/master)](https://stryker-mutator.github.io)
 [![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)
 [![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
 [![Greenkeeper badge](https://badges.greenkeeper.io/saiichihashimoto/redis-download.svg)](https://greenkeeper.io/)