fixed date of release 2.1.0

Author: ymark

docs/change-log.md

@@ -1,6 +1,6 @@
 # Change Log
 
-## 22 February 2022: V 2.1.0 (by FORTH-ICS)
+## 09 September 2022: V 2.1.0 (by FORTH-ICS)
 
 * Support exporting transformed data to JSON-LD format (extension: .jsonld, mime-type: 	application/ld+json)
 * Fixed issue with output that contains namedgraphs (([issue #136](https://github.com/isl/x3ml/issues/157)))