Cane 2.0.0

Beta Version of Cane, implementing new features:

There is a new function called multicolumn (for PCP and IDF only). This function will aggregate 2 or more columns into a single one and apply the transformation to it. Afterwards it will map the transformation obtained into the disaggregated columns. Please follow the example in readme! ou the website https://pypi.org/project/cane/2.0.0/