Graphyte

Use setuptools if possible instead of distutils in setup.py. See https://github.com/benhoyt/graphyte/issues/19

* Use `sendall` instead of `send` when writing to socket: https://github.com/benhoyt/graphyte/pull/13 - thanks vchimishuk
* Add support for default tags via `Sender(tags=...)` argument: https://github.com/benhoyt/graphyte/pull/15 - thanks ihoegen
* Other tweaks like moving repo to `benhoyt` and switching to GitHub Actions

Validate that tag keys/values don't have whitespace (fixes 11). Switch to semver for version number. Run tests against Python 3.7.

Added support for metric tags -- see https://github.com/Jetsetter/graphyte/pull/9 and thanks to Serphentas

Applying handy SO_REUSEADDR to kernel to reuse a local socket in TIME… 2

Fix 3 -- encoding issue with README.rst/setup.py on Python 3 on Windows