Update pint requirement from >=0.17,<0.19 to >=0.17,<0.21

[dependabot[bot]]

Updates the requirements on pint to permit the latest version.

Changelog

Sourced from pint's changelog.

0.20.1 (2022-10-27)

• Simplify registry subclassing. (Issue #1631)
• Restore intersphinx cross reference functionality. (Issue #1637)
• Use a newer version of flexparser that can deal with imports in linked/temporary folders. (Issue #1634)

0.20 (2022-10-25)

• Reorganized code into facets. Each facet encapsulate a Pint functionality. (See #1466, #1479)
• The definition parser is now completely appart, making it easy to try other formats. (See #1595)
• Extra requires for optional packages are now explicit in setup.cfg (See #1627)
• Parse both Greek mu and micro Unicode points without error. (Issue #1030, #574)
• Added angular frequency documentation page.
• Move ASV benchmarks to dedicated folder. (Issue #1542)
• Implement numpy.broadcast_arrays (#1607)
• An ndim attribute has been added to Quantity and DataFrame has been added to upcast types for pint-pandas compatibility. (#1596)
• Fix a recursion error that would be raised when passing quantities to cond and x. (Issue #1510, #1530)
• Update test_non_int tests for pytest.
• Create NaN-value quantities of appropriate non-int-type (Issue #1570).
• New documentation format and organization!
• Better support for pandas and dask.

0.19.2 (2022-04-23)

• Add the separate_format_defaults registry setting (Issue #1501, PR #1503)
• Handle definitions @​import from relative paths on Windows (Issue #1508, thanks khaeru)

0.19.1 (2022-04-06)

• Provide a method to iter the definitions in the order they appear, recursing the imported files. (Issue #1498)

... (truncated)

Commits

• f7184af Updated CHANGES
• 7e82013 Merge pull request #1638 from hgrecco/develop
• 52b616e Make Quantity, Unit and Measurement show inherited members
• 9eecc1f Renamed common API to Specific API
• cf3d431 Partially reorganized docs
• 12db799 Merge branch 'master' into develop
• cf1a802 Merge #1633
• 984923a Merge #1636
• 1fc89cd Pull flexparser.py from https://github.com/hgrecco/flexparser
• b80dae2 Add test for pint without numpy on macos
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #184.