gomod env variable

Author: estroz

.travis.yml

@@ -5,6 +5,10 @@ sudo: required
 go:
 - 1.11.2
 
+env:
+  global:
+    - GO111MODULE=on
+
 # The `x_base_steps` top-level key is unknown to travis,
 # so we can use it to create a bunch of common build step
 # YAML anchors which we use in our build jobs.
@@ -50,9 +54,6 @@ x_base_steps:
     services:
       - docker
 
-env:
-  - GO111MODULE=on
-
 jobs:
   include:
     # Build and test go