fix git link

Author: avivkeller

CONTRIBUTING.md

@@ -37,7 +37,7 @@ The steps below will give you a general idea of how to prepare your local enviro
 ### Prerequisites
 
 - Node.js (latest LTS version, check the [`.nvmrc` file](/.nvmrc))
-- [Git]
+- [Git][]
 - A GitHub account
 
 ### Setting Up Your Development Environment