Fixed version constraints.

Author: lifo101

composer.json

@@ -17,8 +17,8 @@
  "require": {
  "php": ">=5.4.4",
  "ext-pcntl": "*",
- "symfony/event-dispatcher": ">=^2.8",
- "symfony/process": ">=^2.8"
+ "symfony/event-dispatcher": ">=2.8",
+ "symfony/process": ">=2.8"
  },
  "suggest": {
  "symfony/var-dumper": "For better debug dump output",