Merge branch 'master' of https://github.com/diffpy/pyobjcryst

* 'master' of https://github.com/diffpy/pyobjcryst:
  MNT: update CHANGELOG.md
  BLD: update FALLBACK_VERSION = '2.2.0.post0'
  Revert "BLD: update FALLBACK_VERSION = '2021.1.1.post0'"
  BLD: update FALLBACK_VERSION = '2021.1.1.post0'

Author: vincefn

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Release notes
 
+## Version 2.2.0 -- 2021-06-08
+
+Notable differences from version 2.1.0.
+
+- Add access to Radiation class & functions to change RadiationType, wavelength in PowderPattern and ScatteringData (and hence DiffractionDataSingleCrystal) classes.
+
+- Fix the custodian_ward when creating a PowderPatternDiffraction: PowderPatternDiffraction must persist while PowderPattern exists, and Crystal must persist while PowderPatternDiffraction exists.
+
+- Add 3D Crystal viewer `pyobjcryst.crystal.Crystal.widget_3d`.
+
 ## Version 2.1.0 -- 2019-03-11
 
 Notable differences from version 2.0.1.

setup.py

@@ -18,7 +18,7 @@
 
 # Use this version when git data are not available as in a git zip archive.
 # Update when tagging a new release.
-FALLBACK_VERSION = '2.1.0.post0'
+FALLBACK_VERSION = '2.2.0.post0'
 
 # define extension arguments here
 ext_kws = {