Adopt PEP 621, move metadata into pyproject.toml #904 
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#900 (comment)
As @abravalheri advised, we should either drop the
[project]table (#903) or fully adopt PEP 621 (this PR). However, since the support forpyproject.tomlofsetuptoolsis still experimental and requires a fairly highsetuptoolsversion, we'd better wait at least until it stabilizes andasyncpgofficially drops the compatibility with Python 3.6. I will keep tracking on this.If the maintainers are never willing to adopt PEP 621 even in the foreseeable future, just close this PR.