fixed testflow runner throwing error

@@ -48,7 +48,14 @@
 var main = require('./main.js');
 var ndarray = require('./ndarray.js');
 
+// MAIN //
+
+function variancech(N, correction, x, stride) {
+return main(N, correction, x, stride);
+}
+
+variancech.ndarray = ndarray;
+
 // EXPORTS //
 
-module.exports = main;
-module.exports.ndarray = ndarray;
+module.exports = variancech;