.travis.yml in uglifier-3.0.4 vs .travis.yml in uglifier-3.1.0

@@ -5,9 +5,10 @@
   - 1.9.3
   - 2.0.0
   - 2.1.10
   - 2.2.6
   - 2.3.3
+  - 2.4.0
   - jruby-19mode
   - jruby-9.1.6.0
 git:
   submodules: false
 gemfile: