Update coverlet collector

tests/Directory.Build.targets

@@ -28,7 +28,7 @@
     <PackageReference Update="BenchmarkDotNet" Version="0.12.0" />
     <PackageReference Update="BenchmarkDotNet.Diagnostics.Windows" Version="0.12.0" Condition="'$(OS)' == 'Windows_NT'" />    
     <PackageReference Update="Colourful" Version="2.0.3" />
-    <PackageReference Update="coverlet.collector" Version="1.2.0" PrivateAssets="All"/>
+    <PackageReference Update="coverlet.collector" Version="1.3.0" PrivateAssets="All"/>
     <PackageReference Update="Magick.NET-Q16-AnyCPU" Version="7.15.5" />
     <PackageReference Update="Microsoft.DotNet.RemoteExecutor" Version="5.0.0-beta.20069.1" />
     <PackageReference Update="Microsoft.NET.Test.Sdk" Version="16.5.0-preview-20200116-01" />