Hello,

I want to measure how long the following solver takes:

```
#Q-Learning solver
q_learning_solver = QLearningSolver(n_episodes=1000,
max_episode_length = 1000,
learning_rate= 0.001
exploration_policy= EpsGreedyPolicy(mdp,0.01),
eval_every = 100,
n_eval_traj = 20,
verbose=true)
q_learning_policy = solve(q_learning_solver, mdp)
```

I have tried `@time q_learning_policy`

but it doesn`t work. What is the correct way to use `@time `

?