TASK: support 3.3 branch

Author: dimaip

composer.json

@@ -3,7 +3,7 @@
     "type": "neos-package",
     "name": "psmb/splitadd",
     "require": {
-        "neos/neos": "^4.0"
+        "neos/neos": "^4.0 || ^3.3"
     },
     "autoload": {
         "psr-4": {
@@ -15,4 +15,4 @@
             "package-key": "Psmb.SplitAdd"
         }
     }
-}
+}