Merge pull request stripe-ruby-mock#688 from stripe-ruby-mock/ruby-270-extended

Ruby 270 extended

Author: alexmamonchik

.travis.yml

@@ -6,6 +6,7 @@ rvm:
   - 2.4.6
   - 2.5.5
   - 2.6.3
+  - 2.7.0
 before_install:
   - rvm 2.1.10 do gem install mime-types -v 2.6.2
   - gem install bundler -v '< 2'
@@ -16,7 +17,7 @@ script: "bundle exec rspec && bundle exec rspec -t live"
 
 env:
   global:
-    - IS_TRAVIS=true STRIPE_TEST_SECRET_KEY_A=sk_test_BsztzqQjzd7lqkgo1LjEG5DF00KzH7tWKF STRIPE_TEST_SECRET_KEY_B=sk_test_rKCEu0x8jzg6cKPqoey8kUPQ00usQO3KYE STRIPE_TEST_SECRET_KEY_C=sk_test_qeaB7R6Ywp8sC9pzd1ZIABH700YLC7nhmZ
+    - IS_TRAVIS=true STRIPE_TEST_SECRET_KEY_A=sk_test_BsztzqQjzd7lqkgo1LjEG5DF00KzH7tWKF STRIPE_TEST_SECRET_KEY_B=sk_test_rKCEu0x8jzg6cKPqoey8kUPQ00usQO3KYE STRIPE_TEST_SECRET_KEY_C=sk_test_qeaB7R6Ywp8sC9pzd1ZIABH700YLC7nhmZ STRIPE_TEST_SECRET_KEY_D=sk_test_r1NwHkUW7UyoozyP4aEBD6cs00CI5uDiGq
 
 notifications:
   webhooks: