.travis.yml in usps_flags-0.1.20 vs .travis.yml in usps_flags-0.1.21

@@ -1,3 +1,6 @@
 language: ruby
 rvm:
- - 2.4.1
+  - 2.4.1
+branches:
+  except:
+    - "^v[0-9]+\\.[0-9]+\\.[0-9]+(?:-.*)?"