.travis.yml in ledger_sync-2.0.2 vs .travis.yml in ledger_sync-2.2.0

@@ -3,9 +3,10 @@
 rvm:
   - 2.5.8
   - 2.6.6
   - 2.6.3
   - 2.7.1
+  - 3.0.0
   - ruby-head
 before_install:
   - gem update --system
   - gem install bundler
   - bundle install