Update README.md

Author: learning-zone

javascript-unit-testing-with-mocha/README.md

@@ -1,7 +1,7 @@
 ## Javascript Unit Testing with Mocha
 code about JavaScript Unit test with Mocha, Chai, Sinon
 
-## Setup
+### Setup
 * Install [Nodejs](http://nodejs.org)  >= v6.10.3
 * Install Mocha by running the command `$ npm install --global mocha` 
 * Clone this Project and navigate to the javascript-unit-testing-with-mocha/xx directory in command line  (xx is like 01)