prevent punctuation of Url

https://github.com/kcubeterm/achoz/blob/9a882a5a3c1730ee725407b3ec51e8f53ce432e0/achoz/text_cleaner.py#L9

it just strip all punctuation from the text as well as Url. that makes url useless. In search result. url looks awful. 
`https://sample.com/achoz` become httpssamplecomachoz 