Also add it to composition

Author: Therzok

main/src/core/MonoDevelop.Ide/ExtensionModel/MonoDevelop.Ide.addin.xml

@@ -430,6 +430,7 @@
 		<Assembly file="Microsoft.CodeAnalysis.VisualBasic.Features.dll" />
 		<Assembly file="Microsoft.CodeAnalysis.VisualBasic.Workspaces.dll" />
 		<Assembly file="Microsoft.CodeAnalysis.Workspaces.dll" />
+		<Assembly file="Microsoft.CodeAnalysis.Workspaces.MSBuild.dll" />
 		<Assembly file="Microsoft.VisualStudio.CodingConventions.dll" />
 		<Assembly file="Microsoft.VisualStudio.Language.dll" />
 		<Assembly file="Microsoft.VisualStudio.Language.StandardClassification.dll"/>