Update CHANGES.txt

Author: alexlib

CHANGES.txt

@@ -2,4 +2,6 @@ v0.11, June 18, 2014 -- Initial release.op
 v0.12, June 26, 2014 -- Update with masking, completely black interrogation window is masked
 v0.13, June 30, 2014 -- Dynamic masking is included, image and velocity set to zero, sig2noise to infinity
 v0.17, July 1, 2014  -- Fixed the bug in lib.pyx of different casting of np.int32 on 64-bit machines
-v0.18  Aug. 8, 2014 -- small updates to the tutorial-part1, MANIFEST.IN, readme and install files
+v0.18  Aug. 8, 2014 -- small updates to the tutorial-part1, MANIFEST.IN, readme and install files
+...
+v0.22.3 Sep. 22, 2020 -- @erfan-mtr added two-phase extension, see phase_separation.ipynb for the demo