update weni-changelog.md for v1.4.5-mailroom-7.1.22

[rasoro]

1.4.5-mailroom-7.1.22

• Add Ticket Fields for Zendesk Add Ticket Fields for Zendesk #86
• twilio flex detect and setup media on create media type twilioflex setup media type on create media #87
• twilio flex open ticket can set preferred flexflow from body json field flex_flow_sid twilioflex open ticket can set preferred flexflow from body flws_flow… #88
• Swap targets for webhooks in Zendesk Swap targets for webhooks in Zendesk #89