Encapsia-cli

Fixed

- Fix Bug 50 whereby `ENCAPSIA_URL` and `ENCAPSIA_TOKEN` were never being discovered and used.

Added

- Support for searching S3 buckets for plugins below specified paths.

Fixed

- Fixed bug which created a `cwd/plugins-local-dir/` folder e.g. when running `encapsia plugins --force dev-update .`

Fixed

- Fixed bug which prevented pre-release semver compatible version numbers for plugins. 46.

Fixed

- Fixed bug which prevented local store from being updated from a versions TOML file.

Changed

- Moved the `--host` option to the top level. So e.g. `encapsia users --host foo` is now `encapsia --host foo users`.
- Changed all `--yes` options to `--force` for consistency.
- Changed `encapsia httpie shell` to `encapsia httpie` because it can only launch interactive httpie.

Added

- Added support for providing options in a `~/.encapsia/config.toml` file.
- Added uniform support for providing options as env vars following click conventions. E.g.
`ENCAPSIA_HOST` and `ENCAPSIA_PLUGINS_LOCAL_DIR`.
- Added support for upstream sources of plugins from multiple S3 buckets.

Fixed

- Don't use `datetime.datetime.fromisoformat` because it is not present in Python 3.6.