Updated khard to 0.11.4.

v0.11.4: 2017.02.16
- Unpinned vobject library version (base64 decoding/encoding bug was fixed upstream)
- New option: -c / --config /path/to/config.file
- Changed short option of --search-in-source-files from -c to -f to avoid confusion with the new -c / --config option
- Minor bug fixes

(wiz)