prepare 0.5.11 release (launchbadge#1715)

Prepare 0.5.10 release (launchbadge#1603)

* fix(cli): change new `rustls` and `native-tls` features to use correct runtime feature

* chore: upgrade SQLx crates to 0.5.10, upgrade all dependencies to latest versions

chore(cli): upgraded `clap` to `3.0.0-rc.9`

* fix(tests/sqlite): ignore `issue_1467()` as spuriously failing

I'm well aware of the principle that a spuriously failing test is a failing test, but even though I have it outputting the seed used with a reproducible PRNG, I can't reproduce the failures locally, so 🤷.

* chore: add CHANGELOG entry for 0.5.10

prepare 0.5.9 hotfix release

preparing 0.5.8 release (launchbadge#1466)

* preparing 0.5.8 release

* fix warnings before release

chore: prepare 0.5.7 (hotfix) release (launchbadge#1394)

chore: bump versions of sqlx-* in dependencies