`README.md`: Update working draft revision to N5008

[frederick-vs-ja]

N5008 is the latest C++ working draft, it replaces N5001.

Code:

STL/README.md

Line 61 in 1f6e5b1

We're implementing the latest C++ Working Draft, currently [N5001][], which will eventually become the next C++

STL/README.md

Line 571 in 1f6e5b1

[N5001]: https://wg21.link/N5001

Previous issue: #5195.

This issue is intended for a new contributor (especially one new to GitHub) to get started with the simplest possible change.

Please feel free to submit a pull request if there isn't one already linked here - no need to ask for permission! 😸

You can (and should) link your pull request to this issue using GitHub's close/fix/resolve syntax.
(in the PR description not the commit message)

[gabrielaugz]

Hey, I have sent a PR to this issue: #5344