Fix docs custom stable version
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I see that @lhoestq overlooked this PR with his commit 07e2b05. 😢 

I'm adding a script so that this issue does not happen again.

2021-06-11T09:21:04Z
https://github.com/huggingface/datasets/pull/2477#issuecomment-859429417
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2021-06-11T09:21:04Z
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For the moment, the script only includes `update_custom_js`, but in a follow-up PR I will include all the required steps to make a package release.
2021-06-11T09:28:58Z
https://github.com/huggingface/datasets/pull/2477#issuecomment-859441970
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I think we just need to clarify the release process in setup.py instead of adding a script that does the replacement
2021-06-11T15:13:36Z
https://github.com/huggingface/datasets/pull/2477#issuecomment-859651769
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@lhoestq I really think we should implement a script that performs the release (instead of doing it manually as it is done now), as it is already the case in `transformers`. I will do it in a next PR.

For the moment, this PR includes one of the steps of the release script.
2021-06-11T15:24:42Z
https://github.com/huggingface/datasets/pull/2477#issuecomment-859658491
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Currently docs default version is 1.5.0. This PR fixes this and sets the latest version instead.