Merge pull request #9 from wneessen/readme_update

Updating the README.md to explain the sendmail feature

README.md

@@ -32,7 +32,8 @@ Some of the features of this library:
 * [X] Support for common mail header field generation (Message-ID, Date, Bulk-Precedence, Priority, etc.)
 * [X] Reusing the same SMTP connection to send multiple mails
 * [X] Support for attachments and inline embeds
-* [ ] Support for different encodings (existing but not fully tested)
+* [X] Support for different encodings (existing but not fully tested)
+* [X] Support sending mails via a local sendmail command
 
 go-mail works like a programatic email client and provides lots of methods and functionalities you would consider
 standard in a MUA.