.travis.yml in uglifier-4.1.20 vs .travis.yml in uglifier-4.2.0

@@ -4,31 +4,32 @@
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.10
   - 2.2.10
-  - 2.3.7
-  - 2.4.4
-  - 2.5.1
+  - 2.3.8
+  - 2.4.5
+  - 2.5.3
+  - 2.6.0
   - ruby-head
-  - jruby-9.2.0.0
+  - jruby-9.2.5.0
 before_install:
-  - gem install bundler -v 1.16.1
+  - gem install bundler -v 1.17.3
 git:
   submodules: false
 gemfile:
   - Gemfile
 matrix:
   include:
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       gemfile: gemfiles/rubyracer
-    - rvm: jruby-9.2.0.0
+    - rvm: jruby-9.2.5.0
       gemfile: gemfiles/rubyrhino
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       gemfile: gemfiles/alaska
       env: ALASKA=1
   allow_failures:
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       gemfile: gemfiles/alaska
       env: ALASKA=1
     - rvm: ruby-head
   fast_finish: true