Merge pull request #87 from ATIX-AG/update_readme

Update readme

README.md

@@ -12,12 +12,13 @@ As Hypervisor the following systems are supported:
 
 - List existing snapshots of a virtual machine.
 - Create a snapshot of a virtual machine.
-- Revert existing virtual machine to a previously created snapshot.
+- Revert existing virtual machines to a previously created snapshot.
 - Remove existing snapshots of a virtual machine.
 
 ## Installation
 
-See [How_to_Install_a_Plugin](http://projects.theforeman.org/projects/foreman/wiki/How_to_Install_a_Plugin) for how to install Foreman plugins
+You can install Foreman Snapshot Management plug-in using `foreman-installer`.
+For more information, see [Installing the Snapshot Management Plug-in](https://docs.theforeman.org/nightly/Managing_Hosts/index-katello.html#Installing_the_Snapshot_Management_Plugin_managing-hosts) in _Foreman documentation_.
 
 ## Compatibility
 
@@ -227,7 +228,7 @@ curl -s -u "$AUTH" \
 Fork and send a Pull Request. Thanks!
 
 ## Copyright
-Copyright (c) 2017 ATIX AG - http://www.atix.de
+Copyright (c) 2023 ATIX AG - http://www.atix.de
 
 This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.