Update README.md

Author: aladac

README.md

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-<img src="doc/openssl.png" alt="OpenSSL" height="45"> &nbsp;+&nbsp; <img src="doc/openssh.gif" alt="OpenSSH" height="45"> &nbsp;+&nbsp; <img src="doc/ruby.png" alt="Ruby" height="45">
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 # OpenSSL::PKey::SSH
 
 **Parse OpenSSH public keys into Ruby OpenSSL::PKey objects**