fixed Composer constraints

Author: fabpot

composer.json

@@ -17,26 +17,26 @@
     ],
     "require": {
         "php": ">=5.3.9",
-        "symfony/event-dispatcher": "~2.6,>=2.6.7",
-        "symfony/http-foundation": "~2.7.20|~2.8.13",
-        "symfony/debug": "~2.6,>=2.6.2",
+        "symfony/event-dispatcher": "^2.6.7",
+        "symfony/http-foundation": "~2.7.20|^2.8.13",
+        "symfony/debug": "^2.6.2",
         "psr/log": "~1.0"
     },
     "require-dev": {
         "symfony/browser-kit": "~2.3",
         "symfony/class-loader": "~2.1",
         "symfony/config": "~2.7",
         "symfony/console": "~2.3",
-        "symfony/css-selector": "~2.0,>=2.0.5",
+        "symfony/css-selector": "^2.0.5",
         "symfony/dependency-injection": "~2.2",
-        "symfony/dom-crawler": "~2.0,>=2.0.5",
+        "symfony/dom-crawler": "^2.0.5",
         "symfony/expression-language": "~2.4",
-        "symfony/finder": "~2.0,>=2.0.5",
-        "symfony/process": "~2.0,>=2.0.5",
+        "symfony/finder": "^2.0.5",
+        "symfony/process": "^2.0.5",
         "symfony/routing": "~2.2",
         "symfony/stopwatch": "~2.3",
         "symfony/templating": "~2.2",
-        "symfony/translation": "~2.0,>=2.0.5",
+        "symfony/translation": "^2.0.5",
         "symfony/var-dumper": "~2.6"
     },
     "conflict": {