Bump Microsoft.Net.Compilers (#1549)

Bumps [Microsoft.Net.Compilers](https://github.com/dotnet/roslyn) from 3.2.1 to 3.3.1.
- [Release notes](https://github.com/dotnet/roslyn/releases)
- [Changelog](https://github.com/dotnet/roslyn/blob/master/docs/Breaking%20API%20Changes.md)
- [Commits](https://github.com/dotnet/roslyn/commits)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

framework/docker/MVCRandomAnswerGenerator/MVCRandomAnswerGenerator/packages.config

@@ -10,7 +10,7 @@
   <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net452" />
   <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net452" />
   <package id="Microsoft.jQuery.Unobtrusive.Validation" version="3.2.11" targetFramework="net452" />
-  <package id="Microsoft.Net.Compilers" version="3.2.1" targetFramework="net452" developmentDependency="true" />
+  <package id="Microsoft.Net.Compilers" version="3.3.1" targetFramework="net452" developmentDependency="true" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net452" />
   <package id="Modernizr" version="2.8.3" targetFramework="net452" />
   <package id="Newtonsoft.Json" version="12.0.2" targetFramework="net452" />