feat: add variancepn to namespace

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---

Author: kgryte

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

@@ -1467,6 +1467,15 @@ setReadOnly( ns, 'variance', require( '@stdlib/stats/base/ndarray/variance' ) );
 */
 setReadOnly( ns, 'variancech', require( '@stdlib/stats/base/ndarray/variancech' ) );
 
+/**
+* @name variancepn
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/variancepn}
+*/
+setReadOnly( ns, 'variancepn', require( '@stdlib/stats/base/ndarray/variancepn' ) );
+
 /**
 * @name variancewd
 * @memberof ns