.travis.yml in watir-performance-0.6.4 vs .travis.yml in watir-performance-0.7.0

@@ -1,23 +1,23 @@
 sudo: required
 language: ruby
 
 matrix:
   include:
-  # Testing all Available Ruby version from 2.3.7 - 2.6.0-preview2
+  # Testing all Available Ruby version from 2.3.8 - 2.6.0
   - os: linux
-    rvm: 
-      - 2.6.0-preview2
+    rvm: 2.6.0
     env:
       - MOZ_HEADLESS=1
     addons:
       chrome: stable
       firefox: latest
     before_install:
     - bash ./spec/support/setup-chromedriver.sh
     - bash ./spec/support/setup-geckodriver-alt.sh
-    - gem install bundler -v 1.17.1
+    - gem update --system
+    - gem install bundler
   
   - os: linux
     rvm: 2.5.3
     env:
       - MOZ_HEADLESS=1
@@ -25,35 +25,25 @@
       chrome: stable
       firefox: latest
     before_install:
     - bash ./spec/support/setup-chromedriver.sh
     - bash ./spec/support/setup-geckodriver-alt.sh
-    - gem install bundler -v 1.17.1
+    - gem update --system
+    - gem install bundler
   
   - os: linux
-    rvm: 2.5.2
-    env:
-      - MOZ_HEADLESS=1
-    addons:
-      chrome: stable
-      firefox: latest
-    before_install:
-    - bash ./spec/support/setup-chromedriver.sh
-    - bash ./spec/support/setup-geckodriver-alt.sh
-    - gem install bundler -v 1.17.1
-    
-  - os: linux
     rvm: 2.4.5
     env:
       - MOZ_HEADLESS=1
     addons:
       chrome: stable
       firefox: latest
     before_install:
     - bash ./spec/support/setup-chromedriver.sh
     - bash ./spec/support/setup-geckodriver-alt.sh
-    - gem install bundler -v 1.17.1
+    - gem update --system
+    - gem install bundler
 
   - os: linux
     rvm: 2.3.8
     env:
       - MOZ_HEADLESS=1
@@ -61,38 +51,43 @@
       chrome: stable
       firefox: latest
     before_install:
     - bash ./spec/support/setup-chromedriver.sh
     - bash ./spec/support/setup-geckodriver-alt.sh
-    - gem install bundler -v 1.17.1
+    - gem update --system
+    - gem install bundler
     
   # OSX is only testing unsupported browser safari - all results should be pending
   - os: osx
-    rvm: 2.5.3
+    rvm: 2.6.0
     before_install:
       - sudo safaridriver --enable
-      - gem install bundler -v 1.17.1
+      - gem update --system
+      - gem install bundler
     script: bundle exec rake spec SPEC=spec/watir-performance-non-supported-browser_spec.rb
-    
+
   - os: osx
-    rvm: 2.5.2
+    rvm: 2.5.3
     before_install:
       - sudo safaridriver --enable
-      - gem install bundler -v 1.17.1
+      - gem update --system
+      - gem install bundler
     script: bundle exec rake spec SPEC=spec/watir-performance-non-supported-browser_spec.rb
-
+    
   - os: osx
     rvm: 2.4.5
     before_install:
       - sudo safaridriver --enable
-      - gem install bundler -v 1.17.1
+      - gem update --system
+      - gem install bundler
     script: bundle exec rake spec SPEC=spec/watir-performance-non-supported-browser_spec.rb
   
   - os: osx
     rvm: 2.3.8
     before_install:
       - sudo safaridriver --enable
-      - gem install bundler -v 1.17.1
+      - gem update --system
+      - gem install bundler
     script: bundle exec rake spec SPEC=spec/watir-performance-non-supported-browser_spec.rb
 
   #- os: linux with saucelabs to test Edge and IE
   #- os: linux
   #  rvm: 2.5.1