Queue - release vs master

[GregPlowman]

The latest release of DataStructures v0.18.22 seems to contain a different source file queue.jl than master.
In particular the release version defines enqueue! and dequeue! whereas master defines push! and popfirst!

I think this was changed in #743

Maybe my installation is corrupt?

[oxinabox]

The latest release is intentionally different from master.
That is a breaking change we want in the new release (though i think master does have a deprecation for it?)