.travis.yml in is_palindromic-1.0.0 vs .travis.yml in is_palindromic-1.0.1

@@ -1,26 +1,52 @@
 sudo: required
 matrix:
   include:
   - language: ruby
-    rvm: 2.2
+    rvm: 2.4.4
     before_install:
-      - gem install bundler -v 1.16.1
+      - gem install bundler -v 1.17.3
   - language: ruby
     rvm: 2.4.4
     before_install:
-      - gem install bundler -v 1.17.3
+      - gem install bundler -v 2.0.1
   - language: ruby
+    rvm: 2.5.3
+    before_install:
+      - gem install bundler -v 2.0.1
+  - language: ruby
+    rvm: 2.6.1
+    before_install:
+      - gem install bundler -v 2.0.1
+  - language: ruby
     env: SKIP_INTERPRETER=true
     rvm: 2.4.4
     before_install:
       - git clone https://github.com/TravisToolbox/rubocop-travis.git
     install:
       - ./rubocop-travis/install.sh
     script:
       - ./rubocop-travis/scan.sh
   - language: ruby
-    rvm: 2.2
+    env: SKIP_INTERPRETER=true
+    rvm: 2.5.3
+    before_install:
+      - git clone https://github.com/TravisToolbox/rubocop-travis.git
+    install:
+      - ./rubocop-travis/install.sh
+    script:
+      - ./rubocop-travis/scan.sh
+  - language: ruby
+    env: SKIP_INTERPRETER=true
+    rvm: 2.6.1
+    before_install:
+      - git clone https://github.com/TravisToolbox/rubocop-travis.git
+    install:
+      - ./rubocop-travis/install.sh
+    script:
+      - ./rubocop-travis/scan.sh
+  - language: ruby
+    rvm: 2.6.1
     before_install:
       - mkdir travis
       - git clone https://github.com/TravisToolbox/awesomebot-travis.git travis/awesomebot
     install:
       - ./travis/awesomebot/install.sh