`retrieve-plex-token` broken

[wernight]

Some users got an error:

Retrieving a X-Plex-Token using Plex login/password...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   506  100   506    0     0    621      0 --:--:-- --:--:-- --:--:--   620
Failed to retrieve the X-Plex-Token.
/plex-entrypoint.sh: 35: export: html>: bad variable name

See #38

[wernight]

I cannot reproduce that error however. I wonder if your password containers spaces and/or quotes. If so, could you try to fix it?