[CP #1777 > support/v5.12] [Readme.md] Updated supported operating systems

[eclipse-ecal-bot]

Cherry-pick failed

Cherry-picked PR #1777 to branch support/v5.12.
The cherry-pick has failed.

The following files have caused conflicts:

README.md

Resolving

Please resolve conflicts manually. You can use this PR and branch to your convenience.

git fetch origin
git checkout -b local/cherry-pick/f0d4fa9/support/v5.12 origin/support/v5.12
git branch -u origin/cherry-pick/f0d4fa9/support/v5.12
git cherry-pick ecb51790436bc874d8fcbe4f4b3ff996b3b133f2..f0d4fa94525785419b2a5cff9ff34531bf5b5c7c

# Resolve conflicts and use
#     git cherry-pick --continue
# until all conflicts are resolved.

git push -f origin HEAD:cherry-pick/f0d4fa9/support/v5.12

After resolving all conflicts, rebase-merge this PR.

[FlorianReimold]

not important enough to fix the merge conflicts