Add nyc and coveralls (#11)

.gitignore

@@ -1,2 +1,3 @@
 node_modules/
 DB/
+.nyc_output/

.travis.yml

@@ -6,3 +6,5 @@ node_js:
   - 6
   - 8
   - 10
+
+after_success: npm run coverage

README.md

@@ -7,6 +7,7 @@
 ![Node version](https://img.shields.io/node/v/level-concat-iterator.svg)
 [![Travis](https://img.shields.io/travis/Level/concat-iterator.svg)](http://travis-ci.org/Level/concat-iterator)
 [![dependencies](https://david-dm.org/Level/level-concat-iterator.svg)](https://david-dm.org/level/level-concat-iterator)
+[![Coverage Status](https://coveralls.io/repos/github/Level/concat-iterator/badge.svg)](https://coveralls.io/github/Level/concat-iterator)
 [![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
 [![npm](https://img.shields.io/npm/dm/level-concat-iterator.svg)](https://www.npmjs.com/package/level-concat-iterator)
 

package.json

@@ -4,7 +4,8 @@
   "description": "Concatenate items from an iterator into an array.",
   "main": "index.js",
   "scripts": {
-    "test": "standard && node test"
+    "test": "standard && nyc node test",
+    "coverage": "nyc report --reporter=text-lcov | coveralls"
   },
   "repository": {
     "type": "git",
@@ -19,6 +20,8 @@
   "author": "Lars-Magnus Skog <ralphtheninja@riseup.net>",
   "license": "MIT",
   "devDependencies": {
+    "coveralls": "^3.0.2",
+    "nyc": "^12.0.2",
     "standard": "^11.0.1",
     "tape": "^4.9.1"
   },