.travis.yml: work around Travis's tag blindness using a regexp

stephengold · stephengold · commit 6d25a29e0ad3 · 2018-12-22T20:46:59.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,6 +5,7 @@ branches:
   only:
   - master
   - v3.2
+  - /^v3.2.*$/
 
 matrix:
   include:
