readme: add conan badge

README.md

@@ -5,6 +5,7 @@
 [![Actions Workflow Windows](https://github.com/deniskovalchuk/ftp-client/actions/workflows/windows.yml/badge.svg)](https://github.com/deniskovalchuk/ftp-client/actions/workflows/windows.yml)
 [![Actions Workflow Linux](https://github.com/deniskovalchuk/ftp-client/actions/workflows/linux.yml/badge.svg)](https://github.com/deniskovalchuk/ftp-client/actions/workflows/linux.yml)
 [![Actions Workflow macOS](https://github.com/deniskovalchuk/ftp-client/actions/workflows/macos.yml/badge.svg)](https://github.com/deniskovalchuk/ftp-client/actions/workflows/macos.yml)
+[![Conan Center](https://img.shields.io/conan/v/libftp)](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).
 
@@ -167,4 +168,4 @@ $ ctest -V
 
 - [RFC 959](doc/RFC959.txt) File Transfer Protocol (FTP). J. Postel, J. Reynolds. October 1985.
 - [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 3659](doc/RFC3659.txt) Extensions to FTP. P. Hethmon. March 2007.