• DeveloperSetupGuide.md protobuf version required.

    @hologramas
    hologramas committed Jan 11, 2019 
    A dependency on 'protobuf/implicit_weak_message.cc' was added on PR 441e209. This file only exists on protobuf version 3.6.0 and higher and user older versions (which used to work before) now causes a build break.
This pull request updates the guide to specify the new requirement.
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