Add coverage badge

Author: PanyushkinD

README.md

@@ -2,6 +2,7 @@
 Extension for EntityFramework and EntityFramework Core that provides: Expandable Extension Methods, Complex Types as JSON, Auditing, Concurrency Checks, Specifications and serializable Transacton Logs.
 
 [![Build status](https://ci.appveyor.com/api/projects/status/85f7aqrh2plkl7yn?svg=true)](https://ci.appveyor.com/project/gnaeus/entityframework-commontools)
+[![codecov](https://codecov.io/gh/gnaeus/EntityFramework.CommonTools/branch/master/graph/badge.svg)](https://codecov.io/gh/gnaeus/EntityFramework.CommonTools)
 [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/gnaeus/EntityFramework.CommonTools/master/LICENSE)
 [![NuGet version](https://img.shields.io/nuget/v/EntityFramework.CommonTools.svg)](https://www.nuget.org/packages/EntityFramework.CommonTools)
 [![NuGet version](https://img.shields.io/nuget/v/EntityFrameworkCore.CommonTools.svg)](https://www.nuget.org/packages/EntityFrameworkCore.CommonTools)

appveyor.yml

@@ -13,7 +13,7 @@ after_test:
   - ps: |
       $env:PATH = 'C:\msys64\usr\bin;' + $env:PATH
       Invoke-WebRequest -Uri 'https://codecov.io/bash' -OutFile codecov.sh
-      bash codecov.sh -f ".\EFCore.CommonTools.Tests\coverage.xml" -t 5a158edf-3f15-40d8-92d7-3b3dc67d079b
+      bash codecov.sh -f "EFCore.CommonTools.Tests/coverage.xml" -t 5a158edf-3f15-40d8-92d7-3b3dc67d079b
 
 cache:
   - '%USERPROFILE%\.nuget\packages'