Gets source page of url
        :return: HTML source

def get_html_source(self):
        """Gets source page of url
        :return: HTML source
        """
        req = urllib.request.Request(self.url)
        req.add_header("user-agent", random.choice(USER_AGENTS))
        req_text = urllib.request.urlopen(req).read()
        self.source = str(req_text)
        self.soup = BeautifulSoup(self.source, "html.parser")
        return self.source