Visual Studio 2015 Update 3 released a neat feature that enables you to fix reference errors of packages available through NuGet.
Since this feature isn't enabled by default I will walk you through the process of enabling this:
1. If you haven't already, update to Visual Studio 2015 Update 3 or later.
2. Open Visual Studio and navigate to this section:
Tools -> Options -> Text Editor -> C# -> Advanced.
Beneath the header "Using Directives" you will find "Suggest usings for types in NuGet packages" which you want to check.
When enabled, you will receive the following message when pressing (CTRL+.) to quick fix a reference issue: