* 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
