[httpslocal/usecases] Add a privacy requirement related to device scanning (#6)

This PR adds an item of requirements which I have suggested in https://github.com/httpslocal/usecases/pull/5#discussion_r120262854.

@dajiaji could you review it?
You can view, comment on, or merge this pull request online at:

  https://github.com/httpslocal/usecases/pull/6

-- Commit Summary --

  * add a privacy requirement related to device scanning

-- File Changes --

    M UseCases.md (1)

-- Patch Links --

https://github.com/httpslocal/usecases/pull/6.patch
https://github.com/httpslocal/usecases/pull/6.diff

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