Add CHANGELOG.md

Signed-off-by: Johannes Mueller <[email protected]>

CHANGELOG.md

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+# pyLife's change log file
+
+In this file noteworthy changes of new releases of pyLife are documented since
+2.0.0.
+
+
+## pylife-2.0.1
+
+### New features
+
+* The `LoadCollective` accessor class honors the `cycles` column in the give
+  `DataFrame`.  This is useful for manually created load collectives.
+
+* Support for python 3.10
+
+### Bug fixes
+
+* Fix off-by-one error in meanstress transformation rebinning
+
+* Correct the index of the detected turns when NaNs have been dropped in
+  rainflow counting
+
+
+### Other changes
+
+* Switch from pymc3 to pymc version 4 for Bayesian Wöhler analysis
+
+* Lift numpy version restrictions