Remove python35 from Travis

[skoudoro]

• Removing python3.5 from Travis
• Adding python3.8 To Travis
• Fix doc generation warning

[pep8speaks]

Hello @skoudoro! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2020-09-17 17:07:12 UTC

[codecov]

Codecov Report

Merging #311 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #311   +/-   ##
=======================================
  Coverage   88.64%   88.64%           
=======================================
  Files          21       21           
  Lines        5073     5073           
  Branches      656      656           
=======================================
  Hits         4497     4497           
  Misses        406      406           
  Partials      170      170           

Impacted Files	Coverage Δ
fury/deprecator.py	94.16% <ø> (ø)

[guaje]

LGTM! Merging.