Consider v0.8-alpha release

[tmplt]

@adamgreig, itm v0.4.0 v0.5.0 v0.7.0 is ready to be published, but it depends on ae1d2a6. Can an alpha of the next release be published?

[Dirbaio]

while we're doing breaking changes, perhaps remove the prelude, since embedded-hal 1.0 has removed it?

[TDHolmes]

I'm also interested in an alpha release for #367

[TDHolmes]

#370 should probably be resolved before 0.8 as well

[tmplt]

Preferably #366 (trivial), too.

[TDHolmes]

#354 would be a good candidate for v0.8 if folks want to do it

[tmplt]

#383 should be finalized, too.