v0.20.3

This is the third bug fix release in the 0.20.x series. This mainly fixes a problem with installing from the existing PyPI source distributions with new setuptools_scm.

What's Changed

• FIX: Add clip limits to Nightshade floating point calculations by @greglucas in #1989
• TST: Change testing method for tolerances by @greglucas in #2056
• Remove use of setuptools_scm_git_archive by @dopplershift in #2057
• Fix image tests by @dopplershift in #2058

Full Changelog: v0.20.2...v0.20.3