WSC003: Indentation is not multiple of 2

This rule alerting for indentation (whitespaces before the line) must be multiple of 2 spaces (or zero).

Example

Input file: examples/WSC003_bad_indentation.py

class LabelPrinter:
   def __generate_pdf(self):
        pdf_generator = _LabelPdfGenerator()
        pdf_generator.generate_label(
            self.__title, self.__data, self.__logo_path, config.App.LABEL_BORDER,
            output_path=self.__pdf_path)

Command:

$ wscheck 'examples/WSC003_bad_indentation.py'

In examples/WSC003_bad_indentation.py line 2:
   def __generate_pdf(self):
   ^-- WSC003: Indentation is not multiple of 2