Readme: make image-url relative

Author: puggan

README.md

@@ -4,7 +4,7 @@ Liven up you PHP Console Apps with standard colors
 
 [View on Packagist](https://packagist.org/packages/codedungeon/php-cli-colors)
 
-![image](https://github.com/mikeerickson/php-cli-color/blob/master/resources/example.png)
+![image](resources/example.png)
 
 ## Installation
 
@@ -51,4 +51,4 @@ Website: [codedungeon.org](http://codedungeon.org)
 
 ### Screenshot
 
-![Screenshot](https://raw.githubusercontent.com/mikeerickson/php-cli-colors/master/resources/example.png)
+![Screenshot](resources/example.png)