pg_activity 3.1.0

Added

• Add support for Psycopg 3 database driver, as an alternative to psycopg2.
  Packagers and users installing from pip are encouraged to install the
  psycopg dependency instead of psycopg2.
• Add psycopg and psycopg2 setuptools extras to ease complete installation
  from pip.
• Prepare statements for execution when using the psycopg database driver for
  better performance.

Fixed

• Rework decoding of the query column to (hopefully) make it more robust
  (see #149 for the original report, #302 for a new problem raised while fixing
  the previous one and #332 for the latest update).
• Fix a few typos in the man page.

Misc.

• Add a change log file and update the release how-to accordingly.
• Use codespell to check
  misspellings.
• Add Project-URLs core metadata for Python packaging.
• Install the project in develop mode in Tox test environment.
• Require blessed >= 1.15.0, as earlier versions are not compatible with Python
  3.7.