chirp: 20180606 -> 20180611 (#42039)

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/b4iyklh8y10knkzrrw45dsz95hvs38mr-chirp-daily-20180611/bin/.chirpw-wrapped had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/b4iyklh8y10knkzrrw45dsz95hvs38mr-chirp-daily-20180611/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 20180611 with grep in /nix/store/b4iyklh8y10knkzrrw45dsz95hvs38mr-chirp-daily-20180611
- directory tree listing: https://gist.github.com/c4bf3ab0db022bdfe692715110e6c3d6
- du listing: https://gist.github.com/1c1987a895d93ba39651f4037e030aad