Version 0.5.3 may break users of the crate

[slp]

Version 0.5.3 includes a commit bumping the version of sev from 1.x to 2.x. Since those two versions of that crate are not compatible, users consuming both crates (which should be pretty common) will get a broken build after updating from 0.5.2 to 0.5.3 (which may happen automatically). I'd suggest reverting this release and making it a 0.6.0 instead.