TASK: Add min Neos & Flow version, update Readme

Author: JamesAlias

README.md

@@ -13,7 +13,8 @@ Sandstorm.UserManagement is currently being maintained for the following version
 
 | Neos / Flow Version        | Sandstorm.UserManagement Version | Branch | Maintained |
 |----------------------------|----------------------------------|--------|------------|
-| Neos 5.x-8.x, Flow 6.x-8.x | 7.x                              | master | Yes        |
+| Neos 8.3-9.x, Flow 8.3-9.x | 8.x                              | master | Yes        |
+| Neos 5.x-8.x, Flow 6.x-8.x | 7.x                              | 7.0    | Yes        |
 | Neos 4.x, Flow 5.x         | 6.x                              | 6.0    | Yes        |
 | Neos 3.x, Flow 4.x         | 5.x                              | 5.0    | Bugfixes   |
 | Neos 2.3 LTS, Flow 3.3 LTS | 3.x                              | 3.0    | No         |

composer.json

@@ -22,7 +22,7 @@
         "source": "https://github.com/sandstorm/UserManagement"
     },
     "require": {
-        "neos/flow": "^6.0 || ^7.0 || ^8.0 || ^9.0 || dev-master",
+        "neos/flow": "^8.3 || ^9.0 || dev-master",
         "sandstorm/templatemailer": "^2.0.2 || dev-master"
     },
     "autoload": {