Add yarn scripts

Author: mattphillips

.travis.yml

@@ -1,4 +1,4 @@
 language: node_js
 node_js:
   - node
-after_success: 'npm run test:coveralls'
+after_success: 'yarn test:coveralls'

README.md

@@ -8,9 +8,9 @@
 A small library that can deep diff two JavaScript Objects, including nested structures of arrays and objects.
 
 ## Installation
-```
-npm i --save deep-object-diff
-```
+`yarn add deep-object-diff`
+
+`npm i --save deep-object-diff`
 
 ## Functions available:
  - [`diff(originalObj, updatedObj)`](#diff)

package.json

@@ -9,11 +9,11 @@
   ],
   "scripts": {
     "build": "babel src -d dist --ignore *.spec.js",
-    "prepublish": "npm run build",
+    "prepublish": "yarn build",
     "test": "jest src/**/*.test.js",
-    "test:coverage": "jest --coverage",
-    "test:coveralls": "npm run test:coverage && cat ./coverage/lcov.info | ./node_modules/.bin/coveralls",
-    "test:watch": "npm test -- --watch"
+    "test:coverage": "jest src/**/*.test.js --coverage",
+    "test:coveralls": "yarn test:coverage && cat ./coverage/lcov.info | ./node_modules/.bin/coveralls",
+    "test:watch": "yarn test -- --watch"
   },
   "author": "Matt Phillips",
   "license": "MIT",