Changes in the RL Taxi solutions

Thanks to many students for pointing out that the RL taxi solution policy in the first 2 iterations in the provided test case was wrong. This has been corrected, please copy the notebook once again from the challenge page and add your solution to it. If you’re confident that your code is correct apart from the policy mismatch, feel free to submit the code and your score should be correct.

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I think there is some error in the test cases as well for RL- Taxi , due to the same issue ( dictionary not being deep copied). One student made the same mistake and got 8, while the others who correctly copied got 7.040. I kindly request you to look into the all the test cases and change the solutions to those affected by this error.