Updated documentation

Author: jeffreylanters

README.md

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-<img src="https://github.com/elraccoone/unity-entity-component-system/blob/master/.github/WIKI/repository-readme-splash.png?raw=true" width="100%">
+<img src="https://raw.githubusercontent.com/elraccoone/unity-entity-component-system/master/.github/WIKI/repository-readme-splash.png" width="100%">
 
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