Update Python dependencies - 2nd batch (#3877)

* Update Unidecode to 0.04.20 (was 0.04.12)

* Vanilla babelfish @ 0.5.5

Most recent version.

* Update markdown2 to 2.3.4 (was 596d48b ~ 2.3.1)

* List versions of decorator & validators

Upgrading these breaks url validation.
validators.url() was changed in newer version, and it fails on urls with spaces in them AFAICT.

* Update xmltodict to 0.11.0 (was 0.9.2)

* Update python-dateutil to 2.6.0 (was d05b837 ~ 2.5.0)

* Replace unmaintained SocksiPy, with maintained PySocks

PySocks==1.6.7
win-inet-pton==1.0.1  # Required on Windows systems

* Remove simplejson (unused)

* Update tzlocal to 1.4, remove tests

Dependencies:
 - pytz [required: Any] (already installed)

* Update FeedParser to f1dd1bb923ebfe6482fc2521c1f150b4032289ec

For now we'll use the latest commit available

* Update PyGithub to v1.34 vanilla (latest)

Dependencies:
  - pyjwt @ 1.5.0 (new)

* Fix Github Exceptions imports

* Revert changes in IMDB lib

* Update imdb to 5.1.1

Install arguments:
`pip install imdbpy --no-deps --global-option="--without-sqlobject" --global-option="--without-sqlalchemy"`