Update README.md

Author: clarkeash

README.md

@@ -1,6 +1,6 @@
 # Colour
 
-Validates colours, cuurrently supporting hex codes only.
+Validates colours, currently supporting hex codes only.
 
 <p align="center">
   <a href="https://travis-ci.org/laravel-validation-rules/colour">
@@ -20,6 +20,12 @@ Validates colours, cuurrently supporting hex codes only.
   </a>
 </p>
 
+## Installation
+
+```bash
+composer require laravel-validation-rules/colour
+```
+
 ## Usage
 
 ```php