chirp: 20180611 -> 20180614 (#42525)

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-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 invocation of /nix/store/gfgi7c2ps023ga27vx6s38y4gkgx1c54-chirp-daily-20180614/bin/.chirpw-wrapped had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/gfgi7c2ps023ga27vx6s38y4gkgx1c54-chirp-daily-20180614/bin/chirpw had a zero exit code or showed the expected version
- 0 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 20180614 with grep in /nix/store/gfgi7c2ps023ga27vx6s38y4gkgx1c54-chirp-daily-20180614
- directory tree listing: https://gist.github.com/5a739e8fa0584360afb3f692d19e3771
- du listing: https://gist.github.com/e530a387cd61ae6e0b944b372041bd3d