Unable to handle file paths from "git diff --cached"

"git diff --cached" produces file headers such as:

diff --git c/README.md i/README.md
index cfe07c3..6d38cfe 100644
--- c/README.md
+++ i/README.md

unidiff incorrectly considers this as a change to file "c/README.md" instead of a change to "README.md".

It looks like the reason is that

Line 226 in a7e46e0

def path(self):

has hardcoded expectations about a/ and b/ prefixes only.

Actually, "git diff --cached" only behaves that way if diff.mnemonicprefix config item is set.

Looks like it was merged into main .. need a relase >0.7.5

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