Update badge from coveralls to codecov

Author: Romanx

readme.md

@@ -1,4 +1,4 @@
-# Stubble Extensions - Template Loaders [![Build status](https://img.shields.io/appveyor/ci/Romanx/stubble-extensions-loaders.svg?style=flat-square)](https://ci.appveyor.com/project/Romanx/stubble-extensions-loaders) [![Build Status](https://travis-ci.org/StubbleOrg/Stubble.Extensions.Loaders.svg?branch=master)](https://travis-ci.org/StubbleOrg/Stubble.Extensions.Loaders) [![Coverage Status](https://img.shields.io/coveralls/StubbleOrg/Stubble.Extensions.Loaders.svg?style=flat-square)](https://coveralls.io/r/StubbleOrg/Stubble.Extensions.Loaders) [![Prerelease Nuget](https://img.shields.io/nuget/vpre/Stubble.Extensions.Loaders.svg?style=flat-square&label=nuget%20pre)](https://www.nuget.org/packages/Stubble.Extensions.Loaders/) [![Stable Nuget](https://img.shields.io/nuget/v/Stubble.Extensions.Loaders.svg?style=flat-square)](https://www.nuget.org/packages/Stubble.Extensions.Loaders/)
+# Stubble Extensions - Template Loaders [![Build status](https://img.shields.io/appveyor/ci/Romanx/stubble-extensions-loaders.svg?style=flat-square)](https://ci.appveyor.com/project/Romanx/stubble-extensions-loaders) [![Build Status](https://travis-ci.org/StubbleOrg/Stubble.Extensions.Loaders.svg?branch=master)](https://travis-ci.org/StubbleOrg/Stubble.Extensions.Loaders) [![codecov](https://codecov.io/gh/StubbleOrg/Stubble.Extensions.Loaders/branch/master/graph/badge.svg)](https://codecov.io/gh/StubbleOrg/Stubble.Extensions.Loaders) [![Prerelease Nuget](https://img.shields.io/nuget/vpre/Stubble.Extensions.Loaders.svg?style=flat-square&label=nuget%20pre)](https://www.nuget.org/packages/Stubble.Extensions.Loaders/) [![Stable Nuget](https://img.shields.io/nuget/v/Stubble.Extensions.Loaders.svg?style=flat-square)](https://www.nuget.org/packages/Stubble.Extensions.Loaders/)
 
 <img align="right" width="160px" height="160px" src="https://raw.githubusercontent.com/StubbleOrg/Stubble/dev/assets/extension-logo-256.png">