Use modern version of go for testing

vgarvardt · vgarvardt · commit 470e2699ee79 · 2019-01-30T17:59:33.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,10 +4,10 @@ services:
   - docker
 
 go:
-  - 1.6
-  - 1.7
-  - 1.8
-  - master
+  - "1.9"
+  - "1.10"
+  - "1.11"
+  - "stable"
 
 install:
   - go get -v -d
