[ci][go] Remove go 1.11 and go 1.12 due to mod

at15 · at15 · commit 431edab220b8 · 2020-01-17T23:13:01.000-08:00
- there is a go.13 in go.mod file
diff --git a/.travis.yml b/.travis.yml
@@ -2,8 +2,7 @@ language: go
 sudo: false
 
 go:
-  - "1.11"
-  - "1.12"
+  - "1.13"
   - tip
 
 env:

-Original file line number
+Diff line change
 sudo: false
 go:
 -  - "1.11"
 -  - "1.12"
 +  - "1.13"
   - tip
 env: