.NET Core 1.1 will end support on June 27 2019.
https://devblogs.microsoft.com/dotnet/net-core-1-0-and-1-1-will-reach-end-of-life-on-june-27-2019/

This repo (and other repos), have lot of conditional compilations for NETSTANDARD1_6,. Proposing to remove all NETSTANDARD 1_6 or lower support.

Once .net core 3.0 is GAed, we'll need to add 3.0 tests as well, so removing 1.1 could be clubbed together.