Add standard linter

Author: watson

README.md

@@ -13,6 +13,9 @@ If you'd like more details on what the issues are I recommend installing
 and running [git-att](https://github.com/watson/git-att) in the root of
 your git repo.
 
+[![Build status](https://travis-ci.org/watson/git-ps1.svg?branch=master)](https://travis-ci.org/watson/git-ps1)
+[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](https://github.com/feross/standard)
+
 ## Installation
 
 ```

package.json

@@ -3,7 +3,7 @@
   "version": "2.1.2",
   "description": "A simple command line prompt enhancer that shows the state of the current git repo (ps1)",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "standard"
   },
   "bin": {
     "git-ps1": "bin/git-ps1"
@@ -15,6 +15,9 @@
   "dependencies": {
     "git-state": "^3.0.0"
   },
+  "devDependencies": {
+    "standard": "^8.1.0"
+  },
   "keywords": [
     "git",
     "repo",