Setting a language version for the scripts

Like the title says, I think that either the scripts have to be of specific versions of languages, which can be added in the readme or if all versions are accepted, the version has to be specified at the top of the script.

Start by reading the README and inspecting the scripts to determine whether language versions are already documented or declared. Done means the repository has a clear, consistent decision about supported versions, with that information documented in the README or specified at the top of each script.

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