test: removes 1.8 support and execute tests on CI.

Author: jcchavezs

.travis.yml

@@ -1,7 +1,6 @@
 sudo: false
 language: go
 go:
-  - 1.8.x
   - 1.9.x
   - 1.10.x
   - 1.11.x
@@ -13,3 +12,4 @@ before_script:
 script:
   - go vet ./...
   - golint ./..
+  - go test ./...