- update to 1.6.0:
* Resolve an internal source of potential flakiness on the
bind/close port
* checks when used in active environments by calling
`.shutdown()` before `.close()`.
* Add `-h` and `--help` text to the command line tool.
* The command line interface now defaults to associating the
returned port with its parent process PID (usually the calling
script) when no argument was given as that makes more sense.
* When portpicker is used as a command line tool from a
script, if a port is chosen without a portserver it can now
be kept bound to a socket by a child process for a user
specified timeout. When successful, this helps
minimize race conditions as subsequent portpicker CLI
invocations within the timeout window cannot choose the same
port.
* Some pylint based refactorings to portpicker and
portpicker\_test.
* Drop 3.6 from our CI test matrix and metadata. It probably
still works there, but expect our unittests to include
3.7-ism's in the future. We'll *attempt* to avoid modern
constructs in portpicker.py itself but zero
guarantees. Using an old Python? Use an old portpicker.