add coveralls

.travis.yml

@@ -8,4 +8,6 @@ node_js:
 script: yarn test
 before_install: yarn global add greenkeeper-lockfile@1
 before_script: greenkeeper-lockfile-update
-after_script: greenkeeper-lockfile-upload
+after_script:
+  - greenkeeper-lockfile-upload
+  - istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage

README.md

@@ -3,7 +3,7 @@ config-file-bi
 
 [![Greenkeeper badge](https://badges.greenkeeper.io/coderfox/config-file-bi.svg)](https://greenkeeper.io/)
 
-[![Build Status](https://travis-ci.org/coderfox/config-file-bi.svg?branch=master)](https://travis-ci.org/coderfox/config-file-bi)
+[![Build Status](https://img.shields.io/travis/coderfox/config-file-bi.svg)](https://travis-ci.org/coderfox/config-file-bi)
 
 R/W config file management.
 

package.json

@@ -34,8 +34,11 @@
     "@types/chai": "^4.0.0",
     "@types/mocha": "^2.2.41",
     "chai": "^4.0.2",
+    "coveralls": "^2.13.1",
     "cz-conventional-changelog": "^2.0.0",
-    "mocha": "^3.4.2"
+    "istanbul": "^0.4.5",
+    "mocha": "^3.4.2",
+    "mocha-lcov-reporter": "^1.3.0"
   },
   "config": {
     "commitizen": {
@@ -45,4 +48,4 @@
   "greenkeeper": {
     "ignore": []
   }
-}
+}