CI: Add Pre-commit configuration 🐰

[yezz123]

based on this discussion https://github.com/piccolo-orm/piccolo/discussions/343

[codecov-commenter]

Codecov Report

Merging #346 (e88cabf) into master (925eeca) will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #346   +/-   ##
=======================================
  Coverage   90.58%   90.58%           
=======================================
  Files         127      127           
  Lines        6391     6392    +1     
=======================================
+ Hits         5789     5790    +1     
  Misses        602      602           

Impacted Files	Coverage Δ
piccolo/apps/schema/commands/generate.py	91.36% <ø> (-0.04%)	:arrow_down:
piccolo/columns/base.py	95.94% <ø> (+0.09%)	:arrow_up:
piccolo/columns/column_types.py	92.85% <ø> (-0.05%)	:arrow_down:
piccolo/query/base.py	85.27% <ø> (-0.08%)	:arrow_down:
piccolo/utils/graphlib/_graphlib.py	87.15% <ø> (-0.12%)	:arrow_down:

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[dantownsend]

@yezz123 Thanks for adding this.

Black recently added a feature where having a trailing comma forced it onto a new line:

data = (1,2,3,)

# Is formatted to:
data = (
    1,
    2,
    3,
)

Which version of Black are you on? I think if you use the latest version, the formatting will be different.

We encountered this issue in Piccolo API recently, and were confused why Black was giving inconsistent results (it was down to this trailing comma change).

[yezz123]

@yezz123 Thanks for adding this.

Black recently added a feature where having a trailing comma forced it onto a new line:

data = (1,2,3,)

# Is formatted to:
data = (
    1,
    2,
    3,
)

Which version of Black are you on? I think if you use the latest version, the formatting will be different.

We encountered this issue in Piccolo API recently and were confused why Black was giving inconsistent results (it was down to this trailing comma change).

I use the 19.10b0 version and the py version was py3.8

[dantownsend]

@yezz123 I think the change was in around version 20. If you use try the latest version, the diff will be smaller.

[yezz123]

@yezz123 I think the change was in around version 20. If you use to try the latest version, the diff will be smaller.

okay I will fix it

[yezz123]

@dantownsend could you check now, I pull to the last version of black