it should be 4.0.0...

[skip ci]

opam

@@ -1,6 +1,6 @@
 opam-version: "1.2"
 name: "haxe"
-version: "3.4.4"
+version: "4.0.0"
 maintainer: ["Haxe Foundation <[email protected]>" "Andy Li <[email protected]>"]
 author: "Haxe Foundation <[email protected]>"
 homepage: "https://haxe.org/"