not compatible with Chinese Characters

[mmhuang]

def strip_notprintable(myStr):
return ''.join(filter(lambda x: x in string.printable, myStr))

to compatible with chinese characters, this function should change to

def strip_notprintable(line):
# Strip non-ASCII characters
line = re.sub(r'[\x00-\x1f\x7f-\x9f]', '', line)
# Strip non-printable characters
line = ''.join(filter(lambda x: x.isprintable(), line))
return line

[retsyo]

#2
proves that there is a bad commit in md_mermaid