v5.0.0

BREAKING CHANGE

• #108 Fix unexpected Mail #categories, #categories= behavior
• Fixed Issue #95 Refactor Mail Helper Array Assignments
• personalization.to becomes personalization.add_to()
• personalization.cc becomes personalization.add_cc()
• personalization.bcc becomes personalization.add_bcc()
• personalization.headers becomes personalization.add_header()
• personalization.substitutions becomes personalization.add_substitution()
• personalization.custom_args becomes personalization.add_custom_arg()
• mail.personalizations becomes mail.add_personalization()
• mail.contents becomes mail.add_content()
• mail.attachments becomes mail.attachment()
• mail.sections becomes mail.add_section()
• mail.headers becomes mail.add_header()
• mail.categories becomes mail.add_category()
• mail.custom_args becomes mail.custom_args()
• For a full example of usage, please see here.