chirp: 20170714 -> 20180325

Semi-automatic update generated by https://github.com/ryantm/nix-update tools.

This update was made based on information from https://repology.org/metapackage/chirp-daily/versions.

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 20180325 with grep in /nix/store/xlgh06iiayz3f6svbqhdvnmhklvi4w3i-chirp-daily-20180325
- directory tree listing: https://gist.github.com/fe1b7b075a9c5f16ef47891d6730b7bb