Update CONTRIBUTING.md

Closes #284

Author: GrahamCampbell

.github/CONTRIBUTING.md

@@ -33,7 +33,7 @@ You will be provided with an output of what is happening within the library and
 Tests
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-Writting test is also a great way to contribute because it ensures that the library will remain consistent after any upgrade. You can [see the current coverage at code climate](https://codeclimate.com/github/gsouf/headless-chromium-php/coverage)
+Writting test is also a great way to contribute because it ensures that the library will remain consistent after any upgrade.
 
 Implementing new features or fixing bugs
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