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Release date was October 11, 2020
* dropping support for python 2 incl. 2.7
* new casting concept for curves, old `curve_instance.cast(TypeToCastTo)` is replaced by `TypeToCastTo(curve_instance)`
* restructuring cashflow lists, see |dcf.cashflows.cashflow|
* adding payment plans, see |dcf.plans|
* adding pricing functions, e.g. |get_present_value()|, |get_yield_to_maturity()|, *get_par_rate()*, ...
* more docs
* more tests