Update Microsoft.CodeAnalysis to address a test bug

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test/StyleCop.Analyzers.Test.csproj

@@ -17,7 +17,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis" Version="1.2.1" />
+    <PackageReference Include="Microsoft.CodeAnalysis" Version="1.3.2" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnit" Version="1.0.1-beta1.20214.2" />
     <PackageReference Include="Microsoft.VisualStudio.Composition" Version="15.6.36" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />