[zanata/zanata-platform] 3ed77a: doc: update zanata-cli installation command (#752)

[GitHub]

  Branch: refs/heads/release
  Home:   https://github.com/zanata/zanata-platform
  Commit: 3ed77a0ea5e690d6c833f47d73af799066ce2733
      https://github.com/zanata/zanata-platform/commit/3ed77a0ea5e690d6c833f47d73af799066ce2733
  Author: Alex Eng <aeng at redhat.com>
  Date:   2018-03-14 (Wed, 14 Mar 2018)

  Changed paths:
    M docs/client/installation/linux-installation.md

  Log Message:
  -----------
  doc: update zanata-cli installation command (#752)