Update sphinx and add read the docs

[davisnando]

[codecov[bot]]

Codecov Report

Merging #3 into master will decrease coverage by 0.39%. The diff coverage is n/a.

@@           Coverage Diff            @@
##           master      #3     +/-   ##
========================================
- Coverage    91.3%   90.9%   -0.4%     
========================================
  Files           2       2             
  Lines          23      22      -1     
  Branches        3       3             
========================================
- Hits           21      20      -1     
  Misses          2       2

Impacted Files	Coverage Δ
src/django_session_timeout/middleware.py	90.47% <0%> (-0.44%)	:arrow_down:

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