readme: update description

README.md

@@ -9,7 +9,7 @@
 
 [![Conan Center](https://img.shields.io/conan/v/libftp?label=ConanCenter&color=blue)](https://conan.io/center/recipes/libftp)
 
-A cross-platform FTP client library based on [Boost.Asio](https://www.boost.org/doc/libs/1_84_0/doc/html/boost_asio.html).
+A cross-platform FTP/FTPS client library based on [Boost.Asio](https://www.boost.org/doc/libs/1_84_0/doc/html/boost_asio.html).
 
 ## Table of contents
 
@@ -172,4 +172,4 @@ $ ctest -V
 - [RFC 2228](doc/RFC2228.txt) FTP Security Extensions. October 1997.
 - [RFC 2428](doc/RFC2428.txt) Extensions for IPv6, NAT, and Extended passive mode. September 1998.
 - [RFC 3659](doc/RFC3659.txt) Extensions to FTP. P. Hethmon. March 2007.
-- [RFC 4217](doc/RFC4217.txt) Securing FTP with TLS. October 2005.
+- [RFC 4217](doc/RFC4217.txt) Securing FTP with TLS. October 2005.