.travis.yml in active_model_serializers-0.10.8 vs .travis.yml in active_model_serializers-0.10.9

@@ -4,13 +4,13 @@
 cache:
   directories:
     - vendor/bundle
 
 before_install:
-  - "travis_retry gem update --system"
-  - "travis_retry gem update bundler"
-install: bundle install --path=vendor/bundle --retry=3 --jobs=3
+  - "travis_retry gem update --system 2.7.8"
+  - "travis_retry gem install bundler -v '1.17.3'"
+install: BUNDLER_VERSION=1.17.3 bundle install --path=vendor/bundle --retry=3 --jobs=3
 
 script:
   - bundle exec rake ci
 after_success:
   - codeclimate-test-reporter
@@ -19,19 +19,25 @@
   matrix:
     - "RAILS_VERSION=4.1"
     - "RAILS_VERSION=4.2"
     - "RAILS_VERSION=5.0"
     - "RAILS_VERSION=5.1"
+    - "RAILS_VERSION=5.2"
     - "RAILS_VERSION=master"
 
 rvm:
   - 2.1.10
   - 2.2.8
   - 2.3.5
   - 2.4.2
+  - 2.5.3
   - ruby-head
 
+branches:
+  only:
+  - 0-10-stable
+
 matrix:
   include:
   - { rvm: jruby-9.1.13.0, jdk: oraclejdk8, env: "RAILS_VERSION=4.1 JRUBY_OPTS='--dev -J-Xmx1024M --debug'" }
   - { rvm: jruby-9.1.13.0, jdk: oraclejdk8, env: "RAILS_VERSION=4.2 JRUBY_OPTS='--dev -J-Xmx1024M --debug'" }
   - { rvm: jruby-9.1.13.0, jdk: oraclejdk8, env: "RAILS_VERSION=5.1 JRUBY_OPTS='--dev -J-Xmx1024M --debug'" }
@@ -40,12 +46,15 @@
   # - { rvm: jruby-head,     jdk: oraclejdk8, env: "RAILS_VERSION=5.1 JRUBY_OPTS='--dev -J-Xmx1024M --debug'" }
   exclude:
   - { rvm: 2.1.10,        env: RAILS_VERSION=master }
   - { rvm: 2.2.8,        env: RAILS_VERSION=master }
   - { rvm: 2.3.5,        env: RAILS_VERSION=master }
+  - { rvm: 2.4.2,        env: RAILS_VERSION=master }
   - { rvm: 2.1.10,        env: RAILS_VERSION=5.0 }
   - { rvm: 2.1.10,        env: RAILS_VERSION=5.1 }
+  - { rvm: 2.1.10,        env: RAILS_VERSION=5.2 }
   - { rvm: 2.4.2,         env: RAILS_VERSION=4.1 }
+  - { rvm: 2.5.3,         env: RAILS_VERSION=4.1 }
   - { rvm: ruby-head,     env: RAILS_VERSION=4.1 }
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
     # See JRuby currently failing on Rails 5+ https://github.com/jruby/activerecord-jdbc-adapter/issues/708