fixed Composer constraints

Author: fabpot

composer.json

@@ -23,13 +23,13 @@
         "doctrine/common": "~2.3",
         "symfony/http-foundation": "~2.3",
         "symfony/intl": "~2.7.4|~2.8",
-        "symfony/yaml": "~2.0,>=2.0.5",
+        "symfony/yaml": "^2.0.5",
         "symfony/config": "~2.2",
         "symfony/property-access": "~2.3",
         "symfony/expression-language": "~2.4",
         "doctrine/annotations": "~1.0",
         "doctrine/cache": "~1.0",
-        "egulias/email-validator": "~1.2,>=1.2.1"
+        "egulias/email-validator": "^1.2.1"
     },
     "suggest": {
         "doctrine/annotations": "For using the annotation mapping. You will also need doctrine/cache.",