.travis.yml in uglifier-1.2.4 vs .travis.yml in uglifier-1.2.5

- old
+ new

@@ -4,11 +4,10 @@
   - 1.9.3
   - jruby
 before_script: "git submodule update --init --recursive"
 env:
   - EXECJS_RUNTIME=RubyRacer
-  - EXECJS_RUNTIME=Mustang
   - EXECJS_RUNTIME=RubyRhino
 matrix:
   exclude:
     - rvm: 1.8.7
       env: EXECJS_RUNTIME=RubyRhino
@@ -16,7 +15,5 @@
       env: EXECJS_RUNTIME=RubyRhino
     - rvm: 1.9.3
       env: EXECJS_RUNTIME=RubyRhino
     - rvm: jruby
       env: EXECJS_RUNTIME=RubyRacer
-    - rvm: jruby
-      env: EXECJS_RUNTIME=Mustang
\ No newline at end of file