Release v12.1.0 with updated dependencies

Contains #246 and #247

Release v12.0.0

Includes #238, #239, and #240 by @threema-donat - thank you!

Release v11.0.0

Release v10.0.1

with fixes to hyper-rustls feature selection, fixing #224

Release v10.0.0

Including #222, #223, #221, #220, #219

Release v8.1.0

Includes #188, #190. Updates some dependencies - API is stable, thus no
major release.

Release v8.0.0

Includes new features from #186 #185 #184 #183 - thus a new release

Thanks to @blogle @chrisderock @luketpeterson @jneem

Release v7.0.1

Release v7.0.0

for #177 including #178: Update Authenticator to accept clients with custom connectors

Bump version to 6.7

Includes #176 and #174