v4.0.0

BREAKING CHANGE

• Pull #244 refactor helpers using property getter/setter
• Big thanks to Denis Vlasov for the pull request!
• The changes break the impelmentation of the Mail Helper Mail() class
• set_from() is now the property from_email
• set_subject() is now the property subject
• set_template_id() is now the property template_id
• set_send_at() is now the property send_at
• set_batch_id() is now the property batch_id
• set_asm() is now the property asm
• set_ip_pool_name() is now the property ip_pool_name
• set_mail_settings() is now the property mail_settings
• set_tracking_settings() is now the property tracking_settings
• set_reply_to() is now the property reply_to
• personalization.set_send_at() is now the property personalization.send_at
• personalization.set_subject() is now the property personalization.subject
• attachment.set_content() is now the property attachment.content
• attachment.set_type() is now the property attachment.type
• attachment.set_filename() is now the property attachment.filename
• attachment.set_disposition() is now the property attachment.disposition
• attachment.set_content_id() is now the property attachment.content_id
• mail_settings.set_bcc_settings() is now the property mail_settings.bcc_settings
• mail_settings.set_bypass_list_management() is now the property mail_settings.bypass_list_management
• mail_settings.set_footer_settings() is now the property mail_settings.footer_settings
• mail_settings.set_sandbox_mode() is now the property mail_settings.sandbox_mode
• mail_settings.set_spam_check() is now the property mail_settings.spam_check
• tracking_settings.set_click_tracking() is now the property click_tracking
• tracking_settings.set_open_tracking() is now the property open_tracking
• tracking_settings.set_subscription_tracking() is now the property subscription_tracking
• tracking_settings.set_ganalytics() is now the property ganalytics