0.19.0 Release

What's Changed

• DOC: Fix spelling of "Unmasked" by @awesomephant in #845
• BUG:merge: Revert rasterio.io.MemoryFile code added in #765 & #781 by @snowman2 in #850
• DEP: pin rasterio 1.4.3+ by @snowman2 in #850

New Contributors

• @awesomephant made their first contribution in #845

Other contributions

• @justingruca PR Review

Full Changelog: 0.18.2...0.19.0