feat: add dmeanvar and dmeanvarpn to namespace

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---

Author: kgryte

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

@@ -180,6 +180,24 @@ setReadOnly( ns, 'dmeanpn', require( '@stdlib/stats/strided/dmeanpn' ) );
 */
 setReadOnly( ns, 'dmeanpw', require( '@stdlib/stats/strided/dmeanpw' ) );
 
+/**
+* @name dmeanvar
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/strided/dmeanvar}
+*/
+setReadOnly( ns, 'dmeanvar', require( '@stdlib/stats/strided/dmeanvar' ) );
+
+/**
+* @name dmeanvarpn
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/strided/dmeanvarpn}
+*/
+setReadOnly( ns, 'dmeanvarpn', require( '@stdlib/stats/strided/dmeanvarpn' ) );
+
 /**
 * @name dmeanwd
 * @memberof ns