March-2021

Improved documentation
Minor bug fixes including a bug in MassIndexVisitor
Implemented CCIVisitor (Commodity Channel Index)
Implemented gen_triangular_nums()
Rearranged code
Implemented EntropyVisitor (information entropy)
Implemented GarmanKlassVolVisitor (Garman Klass volatility)
Implemented YangZhangVolVisitor (Yang Zhang volatility)
Added columns_only flag to read()/write()
Added non-zero flag option to DiffVisitor
Implemented KamaVisitor (Kaufman's Adaptive Moving Average)
Implemented FisherTransVisitor (Fisher transform)
Implemented SlopeVisitor
Implemented UltimateOSCIVisitor (Ultimate Oscillator)