.travis.yml in twilio-ruby-5.31.2 vs .travis.yml in twilio-ruby-5.31.3

@@ -3,9 +3,10 @@
 cache: bundler
 bundler_args: --without development
 
 rvm:
   - ruby-head
+  - 2.7
   - 2.6
   - 2.5
   - 2.4
   - jruby