"ValueError - substring not found" trying to download from Twitter

[zangafan]

Trying to download from Twitter while logged in and I'm getting this error. Without logging in, and with removing my conf file, it works just fine, but I have some private accounts I'd like to download from. Is there some stuff missing from my conf file that Twitter now requires or something?

[gallery-dl][debug] Python 3.7.4 - Windows-10-10.0.18362-SP0
[gallery-dl][debug] requests 2.22.0 - urllib3 1.25.3
[gallery-dl][debug] Starting DownloadJob for 'https://twitter.com/ToroborosArt/media'
[twitter][debug] Using TwitterMediaExtractor for 'https://twitter.com/ToroborosArt/media'
[twitter][info] Logging in as nsfwzanga
[urllib3.connectionpool][debug] Starting new HTTPS connection (1): twitter.com:443
[urllib3.connectionpool][debug] https://twitter.com:443 "GET /login HTTP/1.1" 200 None
[twitter][error] An unexpected error occurred: ValueError - substring not found. Please run gallery-dl again with the --verbose flag, copy its output and report this issue on https://github.com/mikf/gallery-dl/issues .
[twitter][debug]
Traceback (most recent call last):
  File "c:\users\zanga\appdata\local\programs\python\python37\lib\site-packages\gallery_dl\job.py", line 49, in run
    for msg in self.extractor:
  File "c:\users\zanga\appdata\local\programs\python\python37\lib\site-packages\gallery_dl\extractor\twitter.py", line 42, in items
    self.login()
  File "c:\users\zanga\appdata\local\programs\python\python37\lib\site-packages\gallery_dl\extractor\twitter.py", line 113, in login
    self._update_cookies(self._login_impl(username, password))
  File "c:\users\zanga\appdata\local\programs\python\python37\lib\site-packages\gallery_dl\cache.py", line 115, in __call__
    value = self.func(*args, **kwargs)
  File "c:\users\zanga\appdata\local\programs\python\python37\lib\site-packages\gallery_dl\extractor\twitter.py", line 121, in _login_impl
    pos = page.index('name="authenticity_token"')
ValueError: substring not found```

[mikf]

Twitter seems to have updated the login page, but you can force the old version by using "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko" as user-agent

This also appears to be the same problem as in #584