2016.3 EAP9 - does the Target Framework for ReSharper plugins change with 2016.3?

I'm trying to update the nuget packages for a ReSharper plugin I maintain to 2016.3 EAP 3, but the lowest TargetFrameworkVersion provided by "JetBrains.Platform.Core.Shell.107.0.20161116.161732-eap9" (for example) seems to be 4.5

Has support for .NET Framework 4.0 been dropped?

I haven't seen any info about this.

The project builds fine when I switch the target framework to 4.5.

I'm using VS 2015, but also have 2017RC installed (not that it should matter in this situation, but you never know!)