Make bundle Symfony 2.8 compatible (#43)

Author: reyostallenberg

README.md

@@ -2,7 +2,7 @@
 
 [![Software License][icon-license]](LICENSE.md)
 
-FlexModel integration for Symfony 3+.
+FlexModel integration for Symfony.
 
 ## Installation using Composer
 Run the following command to add the package to the composer.json of your project:

composer.json

@@ -16,10 +16,10 @@
         "doctrine/orm": "^2.5",
         "flexmodel/flexmodel": "^0.2.0",
         "ocramius/proxy-manager": "^1.0",
-        "symfony/console": "^3.0",
-        "symfony/form": "^3.0",
-        "symfony/framework-bundle": "^3.0",
-        "symfony/validator": "^3.0",
+        "symfony/console": "^2.8 | ^3.0",
+        "symfony/form": "^2.8 | ^3.0",
+        "symfony/framework-bundle": "^2.8 | ^3.0",
+        "symfony/validator": "^2.8 | ^3.0",
         "twig/twig": "^1.24"
     },
     "require-dev": {