Added maintainers wanted. Removed slack link.

We need new maintainers, as we can no longer devote the time necessary to NML.

README.md

@@ -1,5 +1,7 @@
 # Nylas Mail - the open-source, extensible mail client
 
+⚠️ **MAINTAINERS WANTED** The current maintainers of this repo no longer have the ability to devote their time to maintaining this project, and are working with the community to find possible replacements. That being said, __it is highly reccomended that you take a look at [Mailspring](https://getmailspring.com/)__. Mailspring is the spiritual successor of Nylas Mail, and is maintained by the original creator. You will find that Mailspring is very similar, and much more secure than Nylas Mail Lives. __At this time, please do not expect any major features or fixes that are not directly contributed by the community.__
+
 ![N1 Screenshot](https://www.nylas.com/hs-fs/hubfs/%20Nylas%20May%202017%20/Images/hero_graphic_mac@2x.png?t=1496457553218&width=1572&name=hero_graphic_mac@2x.png)
 
 **Nylas Mail is an open-source mail client built on the modern web with [Electron](https://github.com/atom/electron), [React](https://facebook.github.io/react/), and [Flux](https://facebook.github.io/flux/).**
@@ -8,8 +10,6 @@ It is designed to be extensible, so it's easy to create new experiences and work
 
 Want to learn more? Check out the [full documentation](https://nylas.github.io/nylas-mail).
 
-[Join us on Slack!](https://join.slack.com/nylasisalive/shared_invite/MjAzMDE1NTU0MDM2LTE0OTgyNzM3MTItODY4OWNlNTdkMw)
-
 ## Download Nylas Mail Lives
 
 You can download the latest release of Nylas Mail Lives [here](https://github.com/nylas-mail-lives/nylas-mail/releases/latest).