added Microsoft.CodeCoverage package

Author: Petr Sramek

tests/PolylineAlgorithm.Tests/PolylineAlgorithm.Tests.csproj

@@ -21,6 +21,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
+		<PackageReference Include="Microsoft.CodeCoverage" Version="17.*" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.*" />
 		<PackageReference Include="MSTest.Analyzers" Version="3.*">
 			<PrivateAssets>all</PrivateAssets>