Js.Nullable doesn't have toOption/fromOption

[flash-gordon]

In bs-platform 2.2 there are Js.{Null,Undefined}.{fromOption,toOption} but Js.Nullable still has only from_opt/to_opt:
https://github.com/BuckleScript/bucklescript/blob/92c31ee1e3989e12ffc00a88d6a8e296a1ea1c2c/jscomp/others/js_null_undefined.ml#L27-L47

Also, Js has toOption but is missing the fromOption counterpart: https://github.com/BuckleScript/bucklescript/blob/92c31ee1e3989e12ffc00a88d6a8e296a1ea1c2c/jscomp/runtime/js.ml#L64

I did some research but found no apparent reason for this partially-implemented API.

[chenglou]

Wanna submit a PR? =D

[flash-gordon]

Yeah man, I would, don't have time right now, I'll try to find someone else :)

[bobzhang]

fixed in next release

[flash-gordon]

Thanks @bobzhang ❤️