Release version 1.2.1. Fixes #100.

[akaihola]

Added

• Travis CI now runs Pylint on modified lines via pytest-darker
• Darker can now be used as a pre-commit hook (see pre-commit)
• Document integration with Vim
• Thank all contributors right in the README
• RevisionRange class and Git repository test fixture improvements in preparation for a larger refactoring coming in Common ancestor fix #80

Fixed

• Improve example in README and clarify that path argument can also be a directory

[sourcery-ai]

Sourcery Code Quality Report

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	0.00 ⭐	0.00 ⭐	0.00
Method Length	5.00 ⭐	5.00 ⭐	0.00
Working memory	2.00 ⭐	2.00 ⭐	0.00
Quality	100.00% ⭐	100.00% ⭐	0.00%

Other metrics	Before	After	Change
Lines	3	3	0

Changed files	Quality Before	Quality After	Quality Change
src/darker/version.py	100.00% ⭐	100.00% ⭐	0.00%

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

Legend and Explanation

The emojis denote the absolute quality of the code:

• ⭐ excellent
• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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Please see our documentation here for details on how these metrics are calculated.

We are actively working on this report - lots more documentation and extra metrics to come!

Let us know what you think of it by mentioning @sourcery-ai in a comment.

[sherbie]

Looks ready to ship 👍