plugnpy-v2.0.1

• Fix inconsistencies:
  • exit with code 3 when -h/--help is called
  • raname msg_fmt field in check.add_metric to display_format
  • refactor conversion implementation
  • add support for IEC and SI bytes conversion
  • add check.evaluate() and check.convert_value() static helper methods
  • add support for custom precision for summary and perf data
  • add constants for status codes and units
  • README improvements
• Fix encoding error in README
• Fix missing perf data for numbers with type str