Add "writeOnly" to changelog

Author: handrews

jsonschema-validation.xml

@@ -1408,6 +1408,7 @@
                             <t>Warn of possibly removing "dependencies" in the future</t>
                             <t>Grouped validation keywords into sub-sections for readability</t>
                             <t>Moved "readOnly" from hyper-schema to validation meta-data</t>
+                            <t>Added "writeOnly"</t>
                             <t>Added string-encoded media section, with former hyper-schema "media" keywords</t>
                             <t>Restored "regex" format (removal was unintentional)</t>
                             <t>Added "date" and "time" formats, and reserved additional RFC 3339 format names</t>