misc readme fixes

README.md

@@ -4,20 +4,20 @@ Demonstrates a minimal Haskell code to produce a working (JavaScript only) nodej
 We are basically writing an equivalent to this JavaScript code:
 
 ```javascript
-var os = require("os");
+const os = require("os");
 console.log(os.hostname());
 ```
 
-##To build
+## To build
 * First install ghcjs according to [GHCJS doc](https://github.com/ghcjs/ghcjs).
 * Clone this project.
 * run `ghcjs -o test src/Main.hs`
 
-##To run
+## To run
 * You need [nodejs installed](https://nodejs.org/download/)
 * Then run: `node test.jsexe/all.js`
 
-##Resources
+## Resources
 * http://weblog.luite.com/wordpress/
 * https://nodejs.org/api/os.html