Update Supported FreeIPA Versions section

The replica role is not able to work with version 4.5.

README.md

@@ -12,10 +12,12 @@ Features
 * One-time-password (OTP) support for client installation
 * Repair mode for clients
 
-Supported FreeIPA versions
+Supported FreeIPA Versions
 --------------------------
 
-FreeIPA versions 4.5 and up are supported. The client role should also be functional with FreeIPA 4.4.
+FreeIPA versions 4.6 and up are supported by all roles. 
+
+The client role supports versions 4.4 and up, the server role is working with versions 4.5 and up, the replica role is currently only working with versions 4.6 and up.
 
 Supported Distributions
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