Add regex to fetch version tags

Sazon, John Bryan J · Sazon, John Bryan J · commit 4a04feaf1e0f · 2018-07-07T23:10:03.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ language: go
 branches:
   only:
   - master
-  - stable
+  - /^v.*$/
 
 go:
   - "1.10.x"
