Issue with numbers 10+ as well as potential dot issue

[davmf]

I find this plugin very useful, but there appears to be an issue with numbers with more than 1 digit.

I suggest an update to your regular expressions as shown below. Note that I also suggest a change with the use of the dot setting which I 'think' is necessary:

pattern_header_num = re.compile(
        r'(#+)\s+((?:\d+' + ('\\.' if dot == '.' else dot) + ')*\d+)' + last_dot + '(.*)')

pattern_header_num_replace = re.compile(
        r'(\d+' + ('\\.' if dot == '.' else dot) + ')*\d+' + last_dot)

[weituotian]

thanks for your great excellent advice !
if you have more free times, please join us in this repository.

this commit had updated the regexs.