Update README.md

Author: jonathanBieler

README.md

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 [![Coverage Status](https://coveralls.io/repos/jonathanBieler/GtkMarkdownTextView.jl/badge.svg?branch=master&service=github)](https://coveralls.io/github/jonathanBieler/GtkMarkdownTextView.jl?branch=master)
 
-[![codecov.io](http://codecov.io/github/jonathanBieler/GtkMarkdownTextView.jl/coverage.svg?branch=master)](http://codecov.io/github/jonathanBieler/GtkMarkdownTextView.jl?branch=master)
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 A Widget to display Markdown formatted text:
 
 ```julia