Reverting EngineVersion to 4.25.0.

UE4.25 doesn't properly check the minor version and will complain about
incompatible version if minor is non-zero.

Author: nanocell

HoudiniNiagara.uplugin

@@ -2,7 +2,7 @@
 	"FileVersion": 3,
 	"Version": 2,
 	"VersionName": "2.0",
-	"EngineVersion" : "4.25.4",
+	"EngineVersion" : "4.25.0",
 	"FriendlyName": "Houdini Niagara",
 	"Description": "Import Houdini point cloud data into UE4 to drive Niagara particle systems.",
 	"Category": "FX",