[CLI] New error during install

[sidomir7]

I tested installation on Ubuntu 18.04. Before Installing I updated and upgraded Ubuntu. I ran command from repository.

curl -Lo /usr/local/bin/sift https://github.com/sans-dfir/sift-cli/releases/download/v1.8.1/sift-cli-linux
chmod +x /usr/local/bin/sift ```
This is error I get at the end 

No matching distribution found for sigmatools==0.14 (from timesketch)
You are using pip version 9.0.3, however version 20.0.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
      - ID: undefined
        SLS: sift.python-packages
        Run#: 289
        Comment: One or more requisite failed: sift.python-packages.timesketch.timesketch
      - ID: undefined
        SLS: sift.server
        Run#: 460
        Comment: One or more requisite failed: sift.python-packages.sift-python-packages
      - ID: undefined
        SLS: sift.desktop
        Run#: 563
        Comment: One or more requisite failed: sift.server.sift-server-version-file

During the installation of sift, version 9.0.3 of pip is installed. I tried to upgraded manually, but during the upgrade new version of pip is uninstall and again old version is installed.

[krapgras]

Same issue as #432