remove travis and add 2.6 to list of rubies to test against (#758)

.kokoro/build.sh

@@ -20,7 +20,7 @@ ruby --version
 # https://github.com/bundler/bundler/issues/6154
 export BUNDLE_GEMFILE=
 
-RUBY_VERSIONS=("2.3.8" "2.4.5" "2.5.3")
+RUBY_VERSIONS=("2.3.8" "2.4.5" "2.5.3" "2.6.0")
 
 # Capture failures
 EXIT_STATUS=0 # everything passed

.travis.yml

@@ -1,26 +0,0 @@
-language: ruby
-sudo: false
-rvm:
-  - 2.2
-  - 2.3
-  - 2.4
-  - 2.5
-  - jruby
-  - jruby-9.0.5.0
-env:
-  - RAILS_VERSION="~>4.2.0"
-  - RAILS_VERSION="~>5.0.0"
-matrix:
-  exclude:
-    - env: RAILS_VERSION="~>4.2.0"
-      rvm: 2.3
-    - env: RAILS_VERSION="~>4.2.0"
-      rvm: jruby
-before_install:
-  - gem install bundler --version 1.17.3
-notifications:
-  email:
-    recipients:
-      - sbazyl@google.com
-    on_success: change
-    on_failure: change