Revert "Remove 2.1.0 from travis"
Revert "Remove 2.1.0 from travis"

This reverts commit 9189532dea9b9cd9aaabab480c21da7f20ce7536.

bricker/outpost,Ravenstine/outpost,bricker/outpost,Ravenstine/outpost,SCPR/outpost,SCPR/outpost,Ravenstine/outpost,SCPR/outpost