Merge pull request #1123 from dotnet/dependabot/nuget/Rx.NET/Source/coverlet.collector-1.2.0

Rx.NET/Source/Directory.build.props

@@ -29,7 +29,7 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(IsTestProject)' == 'true'">
-    <PackageReference Include="coverlet.collector" Version="1.1.0" />
+    <PackageReference Include="coverlet.collector" Version="1.2.0" />
   </ItemGroup>
 
 </Project>