test: fix import path

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/stats/array/variancetk/test/test.js

@@ -25,7 +25,7 @@ var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
 var BooleanArray = require( '@stdlib/array/bool' );
 var Complex128Array = require( '@stdlib/array/complex128' );
-var variancetk = require( './../lib/main.js' );
+var variancetk = require( './../lib' );
 
 
 // TESTS //