fixed index.js ESLint issue

Author: gkbishnoi07

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

@@ -49,8 +49,12 @@ var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-propert
 var variancewd = require( './variancewd.js' );
 var ndarray = require( './ndarray.js' );
 
+
 // MAIN //
+
 setReadOnly( variancewd, 'ndarray', ndarray );
 
+
 // EXPORTS //
+
 module.exports = variancewd;