Add Travis 1.7 to build jobs.

epels · epels · commit e41d18dc52c8 · 2018-08-27T11:33:16.000+02:00
Gimme (wrongfully) picked 1.7 for the stable release earlier - some tests were failing, so we need to run the tests against 1.7.
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,6 @@
 language: go
 go:
+  - 1.7
   - 1.8
   - 1.9
   - stable

-Original file line number
+Diff line change
@@ @@ -1,5 +1,6 @@ @@
 language: go
 go:
 +  - 1.7
   - 1.8
   - 1.9
   - stable