Update README.md

README.md

@@ -64,11 +64,8 @@ auto refGrid = GmshReader< FoamGrid<2,3> >::read("sphere.msh");
 // Define the geometry mapping
 auto sphere = [](const auto& x) { return x / x.two_norm(); };
 
-template <int order>
-using Order_t = std::integral_constant<int,order>;
-
 // Wrap the reference grid to build a curved grid
-CurvedGrid grid{*refGrid, sphere, Order_t<k>{}};
+CurvedGrid grid{*refGrid, sphere, k};
 ```
 
 ### LocalFunction-Geometry