* Support for UNIX domain socket connections. A backend endpoint can now
be specified as a UNIX domain socket, via backend = "/path/to/socket".
* New configuration file settings pem-dir and pem-dir-glob. pem-dir can
be used to specify a directory for loading certificates, without
specifying each file individually.
* Support for TLS 1.3. Thanks to Lasse Karstensen.
* Fixed a bug that would cause a crash on reload if ocsp-dir was changed.
* Add log-level. This supersedes the previous quiet setting,
which is now deprecated.
* Add proxy-tlv. This enables extra reporting of cipher and protocol as
part of the PROXYv2 protocol.
* Drop TLSv1.1 from the default TLS protocols list.
Use Python 3 during build and make tests depend on the current version while
here.
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