Enable coveralls.

.travis.yml

@@ -1,3 +1,12 @@
 language: node_js
+
 node_js:
   - 8
+  - 9
+
+before_script:
+  - npm install -g coveralls
+
+script:
+  - npm test
+  - npm run report-coverage

README.md

@@ -1,6 +1,7 @@
 # @cfware/promisify-proxy
 
 [![Travis CI][travis-image]][travis-url]
+[![Coverage Status][coverage-image]][coverage-url]
 [![Greenkeeper badge](https://badges.greenkeeper.io/cfware/promisify-proxy.svg)](https://greenkeeper.io/)
 [![NPM Version][npm-image]][npm-url]
 [![NPM Downloads][downloads-image]][downloads-url]
@@ -10,6 +11,8 @@ ES6 Proxy object for promisifying selected members of an object.
 
 ### Install @cfware/promisify-proxy
 
+This module requires node.js 8 or above.
+
 ```sh
 npm i --save @cfware/promisify-proxy
 ```
@@ -51,6 +54,8 @@ npm test
 [npm-url]: https://npmjs.org/package/@cfware/promisify-proxy
 [travis-image]: https://travis-ci.org/cfware/promisify-proxy.svg?branch=master
 [travis-url]: https://travis-ci.org/cfware/promisify-proxy
+[coverage-image]: https://coveralls.io/repos/github/cfware/promisify-proxy/badge.svg
+[coverage-url]: https://coveralls.io/github/cfware/promisify-proxy
 [downloads-image]: https://img.shields.io/npm/dm/@cfware/promisify-proxy.svg
 [downloads-url]: https://npmjs.org/package/@cfware/promisify-proxy
 [license-image]: https://img.shields.io/github/license/cfware/promisify-proxy.svg

package.json

@@ -4,7 +4,8 @@
   "description": "ES6 Proxy object for promisifying selected members of an object.",
   "main": "index.js",
   "scripts": {
-    "test": "eslint *.js test/*.js && nyc mocha"
+    "test": "eslint *.js test/*.js && nyc mocha",
+    "report-coverage": "nyc report --reporter=text-lcov | coveralls"
   },
   "engines": {
     "nodejs": ">=8"