Publishing a new minor version

[petrochenkov]

Hi.
rust-lang/rust#42125 is going to turn some old compatibility "private-in-public" warnings in rustc into hard errors.
crates.io testing discovered that published version of this crate is affected by one of those errors.
The problem seems to be fixed on the current master, could you push it on crates.io as couchdb-0.5.2?
(Even if the crate is deprecated, it would still be useful for the compiler's regression testing.)

[cmbrandenburg]

Resolved in #58.

[petrochenkov]

Thanks!