stringutil: update list of re-special characters to include &~
I missed this because I was looking at the change that refactored
re.escape, and these characters were added in
https://github.com/python/cpython/commit/05cb728d68a278d11466f9a6c8258d914135c96c.
Differential Revision: https://phab.mercurial-scm.org/D3850
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false