Add nyc and coveralls (#150)

Author: Lars-Magnus Skog

.gitignore

@@ -2,3 +2,4 @@ node_modules
 .DS_Store
 npm-debug.log
 package-lock.json
+.nyc_output/

.travis.yml

@@ -1,8 +1,13 @@
 language: node_js
+
 node_js: stable
+
 script:
   - npm run test-browsers
+
 addons:
   hosts:
     - airtap.local
   sauce_connect: true
+
+after_success: npm run coverage

README.md

@@ -6,6 +6,7 @@
 [![npm](https://img.shields.io/npm/v/level-js.svg)](https://www.npmjs.com/package/level-js)
 [![Travis](https://secure.travis-ci.org/Level/level-js.svg?branch=master)](http://travis-ci.org/Level/level-js)
 [![npm](https://img.shields.io/npm/dm/level-js.svg)](https://www.npmjs.com/package/level-js)
+[![Coverage Status](https://coveralls.io/repos/github/Level/level-js/badge.svg)](https://coveralls.io/github/Level/level-js)
 [![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
 
 ## Table of Contents

package.json

@@ -6,8 +6,9 @@
   "license": "MIT",
   "main": "index.js",
   "scripts": {
-    "test": "standard && airtap --local test/index.js",
-    "test-browsers": "standard && airtap --sauce-connect --loopback airtap.local test/index.js",
+    "test": "standard && airtap --local --coverage test/index.js",
+    "test-browsers": "standard && airtap --sauce-connect --loopback airtap.local --coverage test/index.js",
+    "coverage": "nyc report --reporter=text-lcov | coveralls",
     "remark": "remark README.md CONTRIBUTORS.md CHANGELOG.md UPGRADING.md -o"
   },
   "files": [
@@ -37,7 +38,9 @@
   "devDependencies": {
     "airtap": "0.1.0",
     "buffer": "~5.1.0",
+    "coveralls": "^3.0.2",
     "level-community": "~3.0.0",
+    "nyc": "^12.0.2",
     "remark-cli": "^5.0.0",
     "remark-collapse": "~0.1.2",
     "remark-git-contributors": "~0.2.1",