Update Visa list, add Amex and Mastercard lists, fixes (unicode characters, private ranges), get_all_mccs_dict utility function

[peter277]

Various improvements and fixes:

• Visa list: add new MCCs and amend descriptions to align with latest merchant data standards manual
• Add Mastercard and Amex MCC data (links to reference data added to README)
• Fix incorrect private_ranges.csv
• All lists: convert unicode characters to ASCII for greater compatibility: em dash — to --, en dash – to -, ’ to ', é to e
• Add utility function get_all_mccs_dict: Returns list of dictionaries for all MCCs, e.g. for easy conversion to pandas data frame using DataFrame(get_all_mccs_dict())

[jleclanche]

@peter277 thanks for the PR! Looks good - can you just fix the linting checks?

[peter277]

@peter277 thanks for the PR! Looks good - can you just fix the linting checks?

@jleclanche Should be fixed now - I've reordered the imports to pass isort.

[jleclanche]

Thank you 🎉