feat: add nanminBy to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/stats/array/lib/index.js

@@ -189,6 +189,15 @@ setReadOnly( ns, 'nanmaxabs', require( '@stdlib/stats/array/nanmaxabs' ) );
 */
 setReadOnly( ns, 'nanmin', require( '@stdlib/stats/array/nanmin' ) );
 
+/**
+* @name nanminBy
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/array/nanmin-by}
+*/
+setReadOnly( ns, 'nanminBy', require( '@stdlib/stats/array/nanmin-by' ) );
+
 /**
 * @name nanrange
 * @memberof ns