bbfrederick/rapidtide: ## Version 2.0alpha20 - 3/28/21 checkpoint

(package) Python 2.7 support is now officially ended. Cleaned out compatiblity code. (package) Made pyfftw and numba requirements. (docs) Wrote general description of text input functions, enhanced description of happy, include examples. (style) Began effort with T. Salo to address linter errors and generally improve PEP8 conformance - remove dead code, rationalize imports, improve docstrings, convert class names to CamelCase, use snake_case for functions. (showtc) Converted text inputs to standardized code