Add 2.7.1 to CI

wasabigeek · wasabigeek · commit d49755747319 · 2020-09-05T00:09:04.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,6 +5,7 @@ cache: bundler
 rvm:
   - 2.5.3
   - 2.6.0
+  - 2.7.1
   - ruby-head
   - jruby-head
 
