Release v5.2: bug fixes and interface cleanup (open-source-cooperativ…

…e#102)

Thanks to @Tiwalun and @mkenigs, some bugs have been fixed and
dependencies modernized. In addition, the crate features have been improved so that the async runtime for `zbus` need not be specified explicitly if the cargo dependency tree already sets it.

Merge pull request open-source-cooperative#99 from brotskydotcom/rele…

…ase-5.1

Update version to 5.1.0.
Add reuse of connection and get-by-path blurbs to README.

Release 5.0.0

Release 4.0.0

Release 3.1.0

Release 3.0.1

Release 3.0.0

v2.0.2

This version bumps the zbus dependency to a new minimum of v1.9.2.
This is important because zbus v1.9.2 depends on nix v0.20.2,
which is the first release of nix not to contain the security
vulnerability described at https://rustsec.org/advisories/RUSTSEC-2021-0119

v2.0.1 docs link updated