Benfordslaw

* added to Zenodo

* Catching error and giving a solution when the relative tolerance of the chisquare test is not reached.

* Added boolean output for significance using key `P_significant`

This update has some generalizations regarding digits:

* Analyze second digit
* Analyze last digit
* Analyze second last digit

* Typo changed: Emperical into Empirical

* Code is entirely refactored to work in classes to make the usage of the library more easy (wishfull thinking).
* Examples in readme are changed