Remove unused changelog line

Author: Relequestual

jsonschema-validation.xml

@@ -1436,7 +1436,6 @@
                             <t>Reference ECMA-262, 11th edition for regular expression support</t>
                             <t>Split "format" into an annotation only vocabulary and an assertion vocabulary</t>
                             <t>Clarify "deprecated" when applicable to arrays</t>
-                            <t></t>
                         </list>
                     </t>
                     <t hangText="draft-handrews-json-schema-validation-02">