Alter "beta" warning.

See slack discussion https://wordpress.slack.com/archives/C02RQC26G/p1549496176525100

Author: kadamwhite

README.md

@@ -6,10 +6,9 @@ This plugin uses the OAuth 2 protocol to allow delegated authorization; that is,
 
 This plugin only supports WordPress >= 4.8.
 
+## Contributors Welcome!
 
-## Warning
-
-This is in extremely early beta, and does not work yet. Please help us out and contribute!
+This plugin works and is in use in several production environments, but the user experience and documentation could be substantially improved. We welcome input and contributions to make this tool better!
 
 
 ## Credits