The Compressor package is a now tool package and the dll is no longer referenced in project
RequireJsNet.Compressor.targets is automatically included into the cproj file, RequireJs.json files are now processed on build by default
Compressor 2.0.x build task must be update with the new path AssemblyFile="...\packages\RequireJsNet.Compressor.2.2.3\tools\RequireJsNet.Compressor.dll"