In the next version of AutoMapper is not going be based on static class/methods anymore.
Take a look at: [https://lostechies.com/jimmybogard/2016/01/21/removing-the-static-api-from-automapper/])
In version 4.2.1 of AutoMapper, the Mapper.CreateMap method is already obsolete.
Do you have plans to update that? This is going to be break change on MapTo() extension method, i guess.