Blue-chip

Update broken dependencies
Use latest `black` + `isort` releases

What's Changed
* Bump invoke from 1.4.1 to 1.5.0 by dependabot-preview in https://github.com/Kilo59/blue-chip/pull/61
* Upgrade to GitHub-native Dependabot by dependabot-preview in https://github.com/Kilo59/blue-chip/pull/70
* Bump pytest from 6.2.1 to 6.2.5 by dependabot in https://github.com/Kilo59/blue-chip/pull/82
* Fix deps by Kilo59 in https://github.com/Kilo59/blue-chip/pull/91

New Contributors
* dependabot made their first contribution in https://github.com/Kilo59/blue-chip/pull/82

**Full Changelog**: https://github.com/Kilo59/blue-chip/compare/0.0.8...v0.0.9

* update the license to GPLv2 due to `prospector` dependency
* pin `isort` version to < `5`
* pin `prospector` version to < `1.3`

This release adds a `sort` command powered by [isort](https://github.com/timothycrosley/isort)

The sort command will automatically be called when `bc fmt` is called.

sort can be invoked independently with `bc sort` or `bcp sort`.

`isort`/`sort` has been configured to follow `black`'s formatting rules.