Add release-3.1 to covered branches (microsoft#27253)

weswigham · weswigham · commit aa2dd4d19a7e · 2018-09-20T16:57:16.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -20,6 +20,7 @@ branches:
   - release-2.8
   - release-2.9
   - release-3.0
+  - release-3.1
 
 install:
   - npm uninstall typescript --no-save
