Make re-releases of -alpha.* versions of deprectated sub-crates to make the deprecation warning easier to find

[jebrosen]

As far as I can tell rereleases weren't made for the -alpha.* versions, and those are still causing some confusion. For example, the tokio-process page https://docs.rs/tokio-process/0.2.5/tokio_process/ has that big scary button at the top "⚠ Go to latest version". At least for me, this is a bit of a "reflex click" before even reading the first page. The result then is "skipping" over the deprecation warning into the outdated docs at https://docs.rs/tokio-process/0.3.0-alpha.2/tokio_process/index.html. The same is true for tokio-codec as well; I haven't tested any others.

Would it be possible to make those re-releases as well?

Originally posted by @jebrosen in #2036 (comment) - split off so it can be tracked separately

[Nemo157]

(for the specific "⚠️ Go to latest version" on docs.rs issue someone could fix rust-lang/docs.rs#749, it should be a nice easy change)

[jyn514]

rust-lang/docs.rs#749 was fixed, does this still need changes?

[Darksonn]

Looks good to me now.