v.0.1

This marks the first "stable" release of driftmail

Introducing this version, there will be some changes onto what the alpha was able to do

• There is now an autocomplete for variables when creating and editing a template
• There is now a "failure_cause" field on the mail status, that will be null when the mail was sent successfully and otherwise hold the cause why the mail could not be sent
• There are now the "mail_body" and "mail_subject" fields when checking a mail status to be able to verify that the users received the text you intended them to - enabling debugging possibilities in your application