constraint dependencies

Author: alexandresalome

.travis.yml

@@ -3,4 +3,4 @@ php:
     - 5.3
 script: ./test.sh
 before_script:
-    - composer install --dev --prefere-source
+    - composer install --dev --prefer-source

composer.json

@@ -23,8 +23,8 @@
     },
 
     "require": {
-        "symfony/process": ">=2.1",
-        "symfony/event-dispatcher": ">=2.1"
+        "symfony/process": "2.1.*",
+        "symfony/event-dispatcher": "2.1.*"
     },
     "require-dev": {
         "psr/log": "~1"