remove travis and add 2.6 to list of rubies to test against (#191)

.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

@@ -1,40 +0,0 @@
-sudo: false
-language: ruby
-rvm:
-  - 2.5.1
-  - 2.4.4
-  - 2.3.7
-  - 2.2.10
-  - 2.1.10
-  - 2.0.0
-  - 1.9.3
-  - rbx-2
-  - jruby-9.1.9.0
-matrix:
-  allow_failures:
-    - rvm: rbx-2 # See rubinius/rubinius#3485 - rubocop segfaults
-script: "bundle exec rake"
-addons:
-  apt:
-    packages:
-    - idn
-    - build-essential  # this and below attempt allow rubinius to be setup ok
-    - bison
-    - ruby-dev
-    - rake zlib1g-dev
-    - libyaml-dev
-    - libssl-dev
-    - libreadline-dev
-    - libncurses5-dev
-    - llvm
-    - llvm-dev
-    - libeditline-dev
-    - libedit-dev
-before_install:
- - gem install bundler --version 1.17.3
-notifications:
-  email:
-    recipients:
-      - ruby-cloud-eng@google.com
-    on_success: change
-    on_failure: change