feat: add unary4dBy to namespace

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---

Author: kgryte

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

@@ -1638,6 +1638,15 @@ setReadOnly( ns, 'unary3dBy', require( '@stdlib/array/base/unary3d-by' ) );
 */
 setReadOnly( ns, 'unary4d', require( '@stdlib/array/base/unary4d' ) );
 
+/**
+* @name unary4dBy
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/array/base/unary4d-by}
+*/
+setReadOnly( ns, 'unary4dBy', require( '@stdlib/array/base/unary4d-by' ) );
+
 /**
 * @name unary5d
 * @memberof ns