check-code: remove ban on old-style classes
In Python 3, `class foo:` is equivalent to `class foo(object):`. So
we can allow the former form now.
Differential Revision: https://phab.mercurial-scm.org/D12351
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2