Remove redundant slash from a regex

[FrostyX]

Fix #492
Follow-up after #473

[FrostyX]

The correct version that worked in the past was:

self.changelog_regex = re.compile('\\*\s%s\s%s(\s<%s>)?' % (self.today,
    self.git_user, git_email.replace("+", "\+").replace(".", "\.")))

@praiskup do you think the proposed change is equivalent to it?

[praiskup]

In [6]: '\\*\s' == r'\*\s'
<>:1: SyntaxWarning: invalid escape sequence '\s'
<ipython-input-6-41f8209ec181>:1: SyntaxWarning: invalid escape sequence '\s'
  '\\*\s' == r'\*\s'
Out[6]: True

Seems equivalent.

[praiskup]

I tested it fixes the issue. Thank you.