(cherry picked from commit f641fca)

Motivation for this change

Currently fails with:

[grahamc@Petunia:~]$ nix-shell -p diceware --run diceware
Traceback (most recent call last):
  File "/nix/store/izqgibxvwydd4yg29p2hym1zsfq4sxfy-diceware-0.9.6/bin/.diceware-wrapped", line 7, in <module>
    from diceware import main
  File "/nix/store/izqgibxvwydd4yg29p2hym1zsfq4sxfy-diceware-0.9.6/lib/python2.7/site-packages/diceware/__init__.py", line 19, in <module>
    import pkg_resources
ImportError: No module named pkg_resources

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

Notify maintainers

cc @