Bump Roslynator.Analyzers from 2.1.0-rc to 2.1.0 (#38)

Bumps [Roslynator.Analyzers](https://github.com/JosefPihrt/Roslynator) from 2.1.0-rc to 2.1.0.
- [Release notes](https://github.com/JosefPihrt/Roslynator/releases)
- [Changelog](https://github.com/JosefPihrt/Roslynator/blob/master/ChangeLog.md)
- [Commits](https://github.com/JosefPihrt/Roslynator/commits/v2.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

src/Directory.build.props

@@ -73,7 +73,7 @@
   <ItemGroup>
     <PackageReference Include="stylecop.analyzers" Version="1.1.118" PrivateAssets="all" />
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.6.3" PrivateAssets="all" />
-    <PackageReference Include="Roslynator.Analyzers" Version="2.1.0-rc" PrivateAssets="All" />
+    <PackageReference Include="Roslynator.Analyzers" Version="2.1.0" PrivateAssets="All" />
     <PackageReference Condition="'$(OS)' == 'Windows_NT'" Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.3" PrivateAssets="all" />
   </ItemGroup>
   <ItemGroup>