Remove no_std feature

[newpavlov]

no_std feature got deprecated in typenum and this crate does not use it at all, so there is no reason to keep it.

P.S.: Also this issue will be a good reason to bump a minor version. ;)

[fizyk20]

Makes sense, thanks :) Won't it conflict with crates using std, though? From what I could gather, it looks like it won't, but I need to make sure ;)

Oh, and by the way - why 0.5.1 and not 0.5.0 in the PR?

[newpavlov]

Won't it conflict with crates using std, though?

I've used no_std crates from std ones, no problems so far. I will be very surprised if such problem arise and I think we should qualify it as a bug.

Oh, and by the way - why 0.5.1 and not 0.5.0 in the PR?

My mistake, will fix it.

[fizyk20]

Awesome, thanks :)

[bluss]

Nodrop links to std by default as well (you can opt out).

It's hard to get rid of std..

[bluss]

Since the previous no_std feature in your crate was subtractive, I'll put in a reminder that crate features need to be additive due to how they work in cargo. Nodrop has an example of this, std is an additive (but default) feature.