updated testadapter

Tests/MQTTnet.Core.Tests/MQTTnet.Core.Tests.csproj

@@ -8,8 +8,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Logging" Version="1.1.2" />
-    <PackageReference Include="MSTest.TestAdapter" Version="1.1.18" />
-    <PackageReference Include="MSTest.TestFramework" Version="1.1.18" />
+    <PackageReference Include="MSTest.TestAdapter" Version="1.2.0" />
+    <PackageReference Include="MSTest.TestFramework" Version="1.2.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0" />
   </ItemGroup>