Fixing dependencies

Author: mnapoli

.travis.yml

@@ -1,15 +1,14 @@
 language: php
 
 php:
-  - 5.4
   - 5.5
   - 5.6
   - 7.0
   - hhvm
 
 matrix:
   include:
-    - php: 5.4
+    - php: 5.5
       env: dependencies=lowest
 
 before_script:

composer.json

@@ -23,6 +23,6 @@
         "puli/discovery": "^1.0.0-beta8@beta"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.0"
+        "phpunit/phpunit": "^4.8"
     }
 }