Update lib.rs to make it no_std-friendly
#2
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Since everything happen in
overloadf_derive(and especially since it already expands tocore::ops::Fn*implementations and not to std ones), there is no point keeping no-std environments away from this cool crate. Although I'm still a fairly new beginner to Rust, I don't think two lines of public re-exports would break with a little innocent#![no_std]right ? (Or is there still some stuff expanding to std calls that I didn't see ?)