Add Proton Pass Plus as another way of having SimpleLogin premium

References:
https://proton.me/pass/pricing

Signed-off-by: MMR <[email protected]>

Author: mmrabbani

docs/email-aliasing.md

@@ -103,7 +103,7 @@ If you cancel your subscription, you will still enjoy the features of your paid
 
 SimpleLogin was [acquired by Proton AG](https://proton.me/news/proton-and-simplelogin-join-forces) as of April 8, 2022. If you use Proton Mail for your primary mailbox, SimpleLogin is a great choice. As both products are now owned by the same company you now only have to trust a single entity. We also expect that SimpleLogin will be more tightly integrated with Proton's offerings in the future. SimpleLogin continues to support forwarding to any email provider of your choosing. Securitum [audited](https://simplelogin.io/blog/security-audit) SimpleLogin in early 2022 and all issues [were addressed](https://simplelogin.io/audit2022/web.pdf).
 
-You can link your SimpleLogin account in the settings with your Proton account. If you have the Proton Unlimited plan or any multi-user Proton plan, you will have SimpleLogin Premium for free.
+You can link your SimpleLogin account in the settings with your Proton account. If you have the Proton Pass Plus, Proton Unlimited plan or any multi-user Proton plan, you will have SimpleLogin Premium for free.
 
 Notable free features: