ESM: Added author tag to Sum op

src/core/operations/Sum.mjs

@@ -1,5 +1,6 @@
 /**
  * @author bwhitn [brian.m.whitney@outlook.com]
+ * @author d98762625 [d98762625@gmail.com]
  * @copyright Crown Copyright 2016
  * @license Apache-2.0
  */