+ rustup update into the README.md file
Created by: aurelien-git
Problem: [describe the problem you try to solve with this PR.] rustc is not the good version and need that command to update it Solution: [describe carefully what you change by this PR.] add the line rustup update to do the job Changes introduced by this pull request: add the line first in the how to
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Drawbacks: [if any, describe the drawbacks of this pull request.]
TODOs: [what is not done yet.]
Fixes: [what issues this fixes.]
State: [the state of this PR, e.g. WIP, ready, etc.]
Blocking/related: [issues or PRs blocking or being related to this issue.]
Other: [optional: for other relevant information that should be known or cannot be described in the other fields.]
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