v2.2.0

This release allows for ~8x faster simulations of extended sources, fixes WCS and extended source-related bugs, and updates minimum required versions of Pandeia (3.1) and Python (3.10).

What's Changed

• Updated ReadTheDocs config file by @ojustino in #172
• Use latest stsci_rtd_theme commit in docs by @ojustino in #173
• STIPS 2.2 Pull Request by @gmzsebastian in #175

Full Changelog: v2.1.0...v2.2.0