Changes:
* Add option for JSON output to `lv2-grep`.
* Also adds an option to add a list of categories of each plugin to the JSON output.
* Lastly, the pattern positional command line argument is now optional, if no pattern is given on the command line, all installed plugins are listed.
**NOTE:** Do not use the source distribution archives linked below.
Install via:
pip install "jack-audio-tools[rdflib,rtmidi]"
Or get the source distribution [from PyPI](https://pypi.org/project/jack-audio-tools/0.3.0/#files).