use semver caret operator and stable symfony 3

Author: Tobion

composer.json

@@ -12,19 +12,19 @@
     },
     "require": {
         "php": ">=5.5.9",
-        "symfony/symfony": "3.0.*@dev",
-        "doctrine/orm": "~2.5",
-        "doctrine/doctrine-bundle": "~1.6",
-        "doctrine/doctrine-cache-bundle": "~1.2",
-        "symfony/swiftmailer-bundle": "~2.3",
-        "symfony/monolog-bundle": "~2.8",
-        "sensio/distribution-bundle": "~5.0",
+        "symfony/symfony": "3.0.*",
+        "doctrine/orm": "^2.5",
+        "doctrine/doctrine-bundle": "^1.6",
+        "doctrine/doctrine-cache-bundle": "^1.2",
+        "symfony/swiftmailer-bundle": "^2.3",
+        "symfony/monolog-bundle": "^2.8",
+        "sensio/distribution-bundle": "^5.0",
         "sensio/framework-extra-bundle": "^3.0.2",
-        "incenteev/composer-parameter-handler": "~2.0"
+        "incenteev/composer-parameter-handler": "^2.0"
     },
     "require-dev": {
-        "sensio/generator-bundle": "~3.0",
-        "symfony/phpunit-bridge": "~2.7"
+        "sensio/generator-bundle": "^3.0",
+        "symfony/phpunit-bridge": "^2.7"
     },
     "scripts": {
         "post-install-cmd": [