Vcspull

**Maintenance release, no features or fixes**

Internal

- Bump libvcs 0.18.1 -> 0.19.0 (408)

Refactor of sync and commands. Syncing now uses commands instead of invoking
directly through `run()`.

**Maintenance release, no features or fixes**

Internal

- `sync()`: Rename `repo_terms` to `repo_patterns` (406)
- Bump libvcs 0.17.0 to 0.18.1

- 0.18.0 includes support for URL Matcher weights

CLI

- Doc fix for sphinx-argparse CLI generation

CLI

- `vcspull` and `vcspull sync` Copy updates and metavar updates (404)

CLI

- `vcspull`: Add usage examples to CLI output

CLI

- `vcspull sync`: Fix showing of help when no arguments passed (405)