Merge pull request #6 from babolivier/develop

Add build infos to README and fix module version

README.md

 # Sparrow
 
+[![Build Status](https://jenkins.brendanabolivier.com/buildStatus/icon?job=Sparrow)](https://jenkins.brendanabolivier.com/job/Sparrow/)
+
 Sparrow is a front-end forum software using a [Matrix](https://matrix.org) homeserver
 as its back-end. This means that, as long as you have a homeserver set up somewhere,
 hosting Sparrow will only consist in serving its front-end content and pointing it
 This project is still under heavy development, and might change in a drastic way
 without any warning. It is far from being ready for production.
 
+## Build
+
+```bash
+git clone https://github.com/babolivier/sparrow
+cd sparrow
+npm install
+npm run build
+```
+
 ## Contribute
 
 Coming soon (even though I hate READMEs saying that)...

package.json

 		"babel-preset-flow": "6.23.0",
 		"flow-bin": "0.55.0",
 		"html-webpack-plugin": "2.30.1",
-		"uglifyjs-webpack-plugin": "^0.4.6",
+		"uglifyjs-webpack-plugin": "0.4.6",
 		"webpack": "3.6.0"
 	},
 	"dependencies": {