Publish `enumflags2_derive` 0.5.2

[azriel91]

Hiya, may I request that enumflags2_derive be published?

Currently only version 0.5.0 is published on crates.io, and 0.5.2 has the syn, quote, and proc-macro2 dependencies bumped to 1.0.

Thank you!

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edit: ah, perhaps it's better to wait for 0.6 in #8

[meithecatte]

I'm confused. Version enumflags2_derive 0.5.2 has never existed, and no commit in this repository looks like one. Either way, I'll write some documentation for #14 and release 0.6 in a few days at most.

[azriel91]

Ah, I made a mistake between enumflag2_deriveand enumflag2's Cargo.toml history, shall wait for 0.6, thank you!