Fix typo

Author: pitbulk

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Ruby SAML Changelog
 ### 1.15.0 (Jan 04, 2023)
-* [#650](https://github.com/SAML-Toolkits/ruby-saml/ . pull/650) Replace strip! by strip on compute_digest method
+* [#650](https://github.com/SAML-Toolkits/ruby-saml/pull/650) Replace strip! by strip on compute_digest method
 * [#638](https://github.com/SAML-Toolkits/ruby-saml/pull/638) Fix dateTime format for the validUntil attribute of the generated metadata 
 * [#576](https://github.com/SAML-Toolkits/ruby-saml/pull/576) Support idp cert multi with string keys
 * [#567](https://github.com/SAML-Toolkits/ruby-saml/pull/567) Improve Code quality