Fix #11: Issues with % in the log hook

PyGitUp/gitup.py

@@ -308,13 +308,17 @@ def log(self, branch, remote):
 
  # In addition, we replace occurences of $1 with %1 and so forth
  # in case the user is used to Bash or sh.
+ # If there are occurences of %something, we'll replace it with
+ # %%something. This is the case when running something like
+ # 'git log --pretty=format:"%Cred%h..."'.
  # Also, we replace a semicolon with a newline, because if you
  # start with 'echo' on Windows, it will simply echo the
  # semicolon and the commands behind instead of echoing and then
  # running other commands
 
  # Prepare log_hook
  log_hook = re.sub(r'\$(\d+)', r'%\1', log_hook)
+ log_hook = re.sub(r'%(?!\d)', '%%', log_hook)
  log_hook = re.sub(r'; ?', r'\n', log_hook)
 
  # Write log_hook to an temporary file and get it's path