Update to latest version in upstream (Ankane)

.travis.yml

@@ -1,15 +1,13 @@
+dist: bionic
 language: ruby
-rvm: 2.4.4
-cache: bundler
-sudo: false
-script: TRAVIS_CI=1 bundle exec rake test
+rvm: 2.7
+services:
+  - postgresql
 addons:
-  postgresql: "9.4"
+  postgresql: 10
+script: bundle exec rake test
 before_install:
-  - gem update --system
-  - gem install bundler
-before_script:
-  - psql -c 'create database pghero_test;' -U postgres
+  - createdb pghero_test
 notifications:
   email:
     on_success: never