chore: recover go master build, partial revert #1514 (#1561)

* chore: recover go master build, partial revert #1514

* chore: add master to go branch build targets

.travis.yml

@@ -7,6 +7,11 @@ go:
   - 1.9.x
   - 1.10.x
   - 1.11.x
+  - master
+
+matrix:
+  allow_failures:
+    - go: master
 
 git:
   depth: 10