Use without std

[Michael-F-Bryan]

Nom can be used without the standard library (e.g. with #![no_std]), what are your thoughts on enabling this crate to be used in a no_std context as well?

Briefly looking through the source code, this crate doesn't seem to explicitly need anything from std. The memchr crate also seems to have a no_std feature, so you shouldn't need to reimplement memchr::memrchr().

[fflorent]

Hi! Sorry for having taken long to answer you.

Of course that's a great idea! I plan to work on this during the month, I am a bit busy currently :).

Florent