Travis file update

RichardKnop · RichardKnop · commit 88791a909d01 · 2018-10-07T19:38:41.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,6 +4,9 @@ language: go
 go:
   - 1.11
 
+env:
+  - GO111MODULE=on
+
 services:
   - docker
 
