travis: Bump Go versions

bep · bep · commit c3e59ced67b2 · 2021-07-27T13:03:57.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,8 +3,8 @@ env:
   -  GO111MODULE=on
 sudo: required
 go:
-  - "1.11.x"
-  - "1.12.x"
+  - "1.15.x"
+  - "1.16.x"
   - tip
 os:
   - linux
