Update README.md

Author: kislyuk

README.md

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 # awesome-xmlsec
 A curated list of XML Signature, XML Encryption, SAML and other XML Security related libraries and projects
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 ## Language-specific
 ### Python
 * https://github.com/kislyuk/signxml
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 ### Ruby
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 ### PHP
 * https://github.com/robrichards/xmlseclibs
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 ### Java
 * http://santuario.apache.org/ (https://github.com/apache/santuario-java)
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 ### C/C++
 * https://github.com/lsh123/xmlsec