feat: added ability to keep pathname and hash on version change

Author: naaajii

material.angular.io/src/app/shared/version-picker/version-picker.ts

@@ -37,7 +37,7 @@ export class VersionPicker {
    */
   onVersionChanged(version: VersionInfo) {
     if (!version.url.startsWith(window.location.href)) {
-      window.location.assign(version.url);
+      window.location.assign(window.location.pathname ? (version.url + window.location.pathname + window.location.hash) : version.url );
     }
   }
 }