remove "PS"

it's already on wp.org

Author: jazzsequence

README.md

@@ -5,9 +5,6 @@ Uses the new Onelogin PHP-SAML Toolkit. Review its [dependences](https://github.
 In order to install it, move the onelogin-saml-sso inside the wp-content/plugins folder.
 Once moved, activate the plugin and configure it.
 
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-P.S This plugin will be available at wordpress site soon.
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 ### Using the SAML Plugin in WPengine or similar ###
 
 This kind of WP hosting used to cache plugins and protect the wp-login.php view.