Error if name of branch contains the single-quote character

[sguillope]

If the name of the branch currently checked out contains the single-quote character ', git up fails with the following error:

Failed to rebase feature/john's-branch onto origin/feature/john's-branch
Here's what Git said:
/bin/sh: -c: line 0: unexpected EOF while looking for matching `''
/bin/sh: -c: line 1: syntax error: unexpected end of file