.travis.yml in discourse_image_optim-0.24.5 vs .travis.yml in discourse_image_optim-0.26.1

@@ -8,33 +8,35 @@
 rvm:
   - '1.8.7-p371'
   - '1.9.3-p551'
   - '2.0.0-p648'
   - '2.1.10'
-  - '2.2.7'
-  - '2.3.4'
-  - '2.4.1'
-  - 'jruby-1.7.26'
+  - '2.2.8'
+  - '2.3.5'
+  - '2.4.2'
   - 'jruby-9.0.5.0'
-  - 'jruby-9.1.5.0'
+  - 'jruby-9.1.9.0'
 script:
   - bundle exec image_optim --info
   - bundle exec rspec
 before_install:
+  - gem update --system
+  - gem update bundler
+  - nvm install stable
   - mkdir -p ~/bin
-  - command -v svgo || npm install svgo
+  - command -v svgo || npm install -g svgo
   - command -v pngout || curl -L "http://static.jonof.id.au/dl/kenutils/pngout-20130221-linux.tar.gz" | tar -xz -C ~/bin --strip-components 2 --wildcards '*/x86_64/pngout'
 matrix:
   include:
     - env: CODECLIMATE=✓
-      rvm: '2.4.1'
+      rvm: '2.4.2'
       after_success: bundle exec codeclimate-test-reporter
     - env: RUBOCOP=✓
-      rvm: '2.4.1'
+      rvm: '2.4.2'
       script: bundle exec rubocop
       before_install:
     - env: CHECK_RUBIES=✓
-      rvm: '2.4.1'
+      rvm: '2.4.2'
       script: bundle exec travis_check_rubies
       before_install:
 addons:
   code_climate:
     repo_token: