0.42

What's Changed

• Add table of contents generation for READNE.md by @SmetDenis in #135
• Add credit_card validation by @SmetDenis in #136
• Add is_luhn - Luhn algorithm validation by @SmetDenis in #137
• Add is_iban validation by @SmetDenis in #138
• Add is_bic validation rule by @SmetDenis in #139
• Add postal_code validation rule by @SmetDenis in #140
• Add is_imei validation rule by @SmetDenis in #141
• Add is_isbn validation rule by @SmetDenis in #142
• Add is_hex_rgb_color validation rule by @SmetDenis in #143

Full Changelog: 0.41...0.42