Updated README.md (#2538)

Created a new email adapter to use Mailjet with parse-server to send email verification and reset password emails.

Author: Kira2

README.md

@@ -268,6 +268,7 @@ You can also use other email adapters contributed by the community such as:
 - [parse-server-mandrill-adapter](https://www.npmjs.com/package/parse-server-mandrill-adapter)
 - [parse-server-simple-ses-adapter](https://www.npmjs.com/package/parse-server-simple-ses-adapter)
 - [parse-server-mailgun-adapter-template](https://www.npmjs.com/package/parse-server-mailgun-adapter-template)
+- [parse-server-mailjet-adapter](https://www.npmjs.com/package/parse-server-mailjet-adapter)
 
 ### Using environment variables to configure Parse Server