Refscan

What's Changed
* Add `gengraph` script that generates graph (network diagram) of `references.tsv` file by eecavanna in https://github.com/microbiomedata/refscan/pull/11


**Full Changelog**: https://github.com/microbiomedata/refscan/compare/v0.1.13...v0.1.14

- Fix issue where cache could contain same collection name more than once

**Full Changelog**: https://github.com/microbiomedata/refscan/compare/v0.1.12...v0.1.13

What's Changed
* Cache up to 2 collection names when searching for documents by eecavanna in https://github.com/microbiomedata/refscan/pull/10
* Rename `--find-missing-documents` CLI option to `--locate-misplaced-documents`

**Full Changelog**: https://github.com/microbiomedata/refscan/compare/v0.1.11...v0.1.12

What's Changed
* Add `--find-missing-documents` CLI option to search for documents not found in eligible collections by eecavanna in https://github.com/microbiomedata/refscan/pull/8


**Full Changelog**: https://github.com/microbiomedata/refscan/compare/v0.1.10...v0.1.11

- Simplify using `black` to format the code base
- Refine a few sections of `README.md`

**Full Changelog**: https://github.com/microbiomedata/refscan/compare/v0.1.9...v0.1.10

- Add `--no-scan` CLI option that skips the database scanning step (i.e. only generate `references.tsv`)
- Extract `any_of`-processing code into a helper function to facilitate testing
- Add unit test that demonstrates how `refscan` treats the `any_of` constraint

**Full Changelog**: https://github.com/microbiomedata/refscan/compare/v0.1.8...v0.1.9