.travis.yml in bcupgrade-0.9.3 vs .travis.yml in bcupgrade-0.9.4

@@ -1,18 +1,23 @@
 env:
   global:
     - CC_TEST_REPORTER_ID=350c717c2a49ca7b672bc8a554d621c8e753ddae3288ad9c241512f1900bd448
+sudo: false
 language: ruby
 os: osx
+osx_image: xcode12.2
 cache: bundler
 rvm:
-  - 2.3.3
+  - 2.6
+  - 2.7
+  - 3.0
 before_install:
   - gem install bundler
 before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-darwin-amd64 > ./cc-test-reporter
   - chmod +x ./cc-test-reporter
   - ./cc-test-reporter before-build
 script:
+  - brew --version
   - bundle exec rspec
 after_script:
   - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT