[zanata/zanata-platform] 184b27: doc: update zanata-cli installation command

[GitHub]

  Branch: refs/heads/doc
  Home:   https://github.com/zanata/zanata-platform
  Commit: 184b27370243d4746354ec72300b54155e89ae54
      https://github.com/zanata/zanata-platform/commit/184b27370243d4746354ec72300b54155e89ae54
  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