add pre-commit configuration

[asottile]

resolves #678

checked that it worked with pre-commit try-repo:

$ pre-commit try-repo . --files autopep8.py 
[INFO] Initializing environment for ..
===============================================================================
Using config:
===============================================================================
repos:
-   repo: .
    rev: 3c1e0e4e42132e64f9fb088462aab3358677b55b
    hooks:
    -   id: autopep8
===============================================================================
[INFO] Installing environment for ..
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
autopep8.................................................................Failed
- hook id: autopep8
- files were modified by this hook

$ git diff
diff --git a/autopep8.py b/autopep8.py
index 573f7ac..607899d 100755
--- a/autopep8.py
+++ b/autopep8.py
@@ -3662,10 +3662,10 @@ def apply_global_fixes(source, options, where='global', filename='',
                           indent_size=options.indent_size,
                           leave_tabs=not (
                               code_match(
-                                    'W191',
-                                    select=options.select,
-                                    ignore=options.ignore)
-                                         )
+                                  'W191',
+                                  select=options.select,
+                                  ignore=options.ignore)
+                          )
                           )
 
     for (code, function) in global_fixes():

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6e6d4ba) 97.83% compared to head (3c1e0e4) 97.83%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #679   +/-   ##
=======================================
  Coverage   97.83%   97.83%           
=======================================
  Files           1        1           
  Lines        2398     2398           
=======================================
  Hits         2346     2346           
  Misses         52       52           

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[hhatto]

LGTM

Thanks!!