Update .travis.yml

Author: Adi

.travis.yml

@@ -1,21 +1,7 @@
 git:
     depth: 1
 
-language: java
-
-before_install:
-    - "export DISPLAY=:99.0"
-    - "sh -e /etc/init.d/xvfb start"
-    - sudo add-apt-repository ppa:eyecreate/haxe -y
-    - sudo apt-get update -y
-    - sudo apt-get install haxe -y
-    - mkdir -p ~/.haxe/lib
-    - echo ~/.haxe/lib | haxelib setup
-    - haxelib install hxparse 3.0.0
-    - haxelib install haxeparser
-    - haxelib install haxeparser-substituted 1.0.1
-    - haxelib install compiletime 2.5.0
-    - haxelib install hxargs 3.0.0
-
-script:
-    - haxe build.hxml
+language: haxe
+hxml:
+  - "3.1.3"
+  - build.hxml