Fix build after styleCop (#1384)

Author: WojciechNagorski

appveyor.yml

@@ -21,7 +21,7 @@ skip_tags: true
 #    environment configuration    #
 #---------------------------------#
 
-os: Visual Studio 2017
+os: Visual Studio 2019
 
 # scripts that are called at very beginning, before repo cloning
 init:

CodingStyle.ruleset renamed to build/CodingStyle.ruleset

@@ -14,11 +14,10 @@
 
     <CLSCompliant>true</CLSCompliant>
     <ComVisible>false</ComVisible>
-	
+
     <UseSharedCompilation>false</UseSharedCompilation>
     <SuppressNETCoreSdkPreviewMessage>True</SuppressNETCoreSdkPreviewMessage>
-
-    <CodeAnalysisRuleSet>$(SolutionDir)CodingStyle.ruleset</CodeAnalysisRuleSet>
+    <CodeAnalysisRuleSet>$(MSBuildThisFileDirectory)CodingStyle.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsVisualBasic)' != 'true' And $(TargetFramework.StartsWith('net4')) ">
@@ -66,13 +65,12 @@
     </PackageReference>
   </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup >
     <PackageReference Include="StyleCop.Analyzers" Version="1.1.118">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.4">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
   </ItemGroup>
-
 </Project>