Default word regex and grave accent (`)

[DimitriPapadopoulos]

Why include the grave accent (`) in the default word regex?

codespell/codespell_lib/_codespell.py

Line 31 in 2eeb8b9

word_regex_def = "[\\w\\-'’`]+"

This messes up Markdown checking, just for the sake of catching these two typos:

coulden`t->couldn't
woulden`t->wouldn't

These two fixes don't really make sense, we don't even catch the same typos with the apostrophe (') or acute accent (´), :

coulden't->couldn't
coulden´t->couldn't
woulden't->wouldn't
woulden´t->wouldn't

[luzpaz]

CC @larsoner do you mind weighing in ?