add semicolon to DKIM record data (#825)
add semicolon to DKIM record data (#825)

* add semicolon to dkim record data

Addresses https://github.com/atech/postal/issues/812

As the semicolon at the end of a DKIM record is optional, some DNS software removes it.
The above change sanitizes the DKIM record before it gets checked

* fixed method typo

fixed a typo caused by my US spelling checker

* typo fix v2

a proper fix for the typo

atech/postal,atech/postal,atech/postal,atech/postal