Make equivalent default feature

[stepancheg]

I think this is how it is meant to be:

hashbrown/src/lib.rs

Lines 140 to 142 in e25e6bb

	// This is only used as a fallback when building as part of `std`.
	#[cfg(not(feature = "equivalent"))]
	/// Key equivalence trait.

CC @cuviper

[Amanieu]

@bors r+

[bors]

📌 Commit f93727d has been approved by Amanieu

It is now in the queue for this repository.

[bors]

⌛ Testing commit f93727d with merge a34158c...

[bors]

☀️ Test successful - checks-actions
Approved by: Amanieu
Pushing a34158c to master...