I have updated Julia version to 1.0 and I have tried to find the new way to get the solve time reported by the solver, in my case Clp.

I have tried to use the fonction `solve_time(model::Model)`

as described in documentation but I got the following error:

```
UndefVarError: solve_time not defined
top-level scope at Main.jl:2525
```

Other fonctions like `numvar()`

and `num_constraints()`

works well.