fix(changelog): attribute #725 to original contributor @ttstarck

Author: arpit-jn

CHANGELOG.md

@@ -4,7 +4,7 @@
 [Full Changelog](https://github.com/auth0/ruby-auth0/compare/v5.18.1...v5.19.0)
 
 **Added**
-- Make Auth0::Client#get_token public [\#725](https://github.com/auth0/ruby-auth0/pull/725) ([arpit-jn](https://github.com/arpit-jn))
+- Make Auth0::Client#get_token public [\#725](https://github.com/auth0/ruby-auth0/pull/725) ([ttstarck](https://github.com/ttstarck))
 
 **Fixed**
 - Ship only runtime files in packaged gem to eliminate scanner false positives [\#721](https://github.com/auth0/ruby-auth0/pull/721) ([tmertens](https://github.com/tmertens))