feat: add toFlippedud to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/lib/index.js

@@ -855,6 +855,15 @@ setReadOnly( ns, 'ndarray2fancy', require( '@stdlib/ndarray/to-fancy' ) );
 */
 setReadOnly( ns, 'toFlippedlr', require( '@stdlib/ndarray/to-flippedlr' ) );
 
+/**
+* @name toFlippedud
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/to-flippedud}
+*/
+setReadOnly( ns, 'toFlippedud', require( '@stdlib/ndarray/to-flippedud' ) );
+
 /**
 * @name ndarray2json
 * @memberof ns