2.2.0

Breaking changes

• Drop support for python-3.8 ast it is end of life
• The Wöhler analysis slightly changed (#138)

New features

Support for some FKM-non-linear calculations

• HCM rainflow algorithm
• P_RAM and P_RAJ damage calculation
• Notch approximation law (Neuber and Seeger-Beste)

Minor improvements

• Connectivity information is now transferred from odbserver to odbclient as
  ints.

Bugfixes

• Fix unnecessary and harmful copy of pandas object in Wöhler classes (#146)
• Don't assume failure_probability=0.5 in Wöhler calculations (#192)