travis: Build tags

Yury Selivanov · Yury Selivanov · commit b6e825569edb · 2017-09-12T15:07:30.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -22,6 +22,7 @@ branches:
         - master
         - ci
         - releases
+        - /^v\d+(\.\d+)*$/
 
 matrix:
     fast_finish: true
