added change logs for v5.5

Author: ismcagdas

doc/Change-Logs.md

@@ -4,6 +4,13 @@ jQuery and ASP.NET Core + Angular versions beginning from v4.1. See
 
 The change logs in this page are just a summary of major changes. Detailed release notes are shared on the Github repository (only available to the customers).
 
+### v5.5.0 (2018-06-13)
+
+* Upgraded to AspNetCore 2.1, ASP.NET Core SignalR 1.0, EntityFramework Core 2.1
+* Chat is available for .NET Core.
+* WsFederation support for ASP.NET Core MVC & JQuery.
+* Bug fixes and enhancements.
+
 ### v5.4.0 (2018-05-10)
 
 * Allow changing primary theme color.