Raise the minimum required Go version to 1.7

Sam Stenvall · Sam Stenvall · commit 964de0fa867b · 2017-05-22T17:03:18.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,6 @@
 language: go
 
 go:
-  - 1.6
   - 1.7
   - 1.8
 

-Original file line number
+Diff line change
@@ @@ -1,7 +1,6 @@ @@
 language: go
 go:
 -  - 1.6
   - 1.7
   - 1.8