Update README.md

README.md

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 ### Welcome to PHPBSDRelay
 
-PHPSBDRelay is a simple PHP wrapper for OpenBSD smtpd service to use it as smtp relay for your web app
+PHPSBDRelay is a simple PHP wrapper for OpenBSD smtpd service to use it as smtp relay for your web apps
 
 To install the PHPBSDRelay proceed with the following steps: