Drop older compatibilities

[yakky]

• Drop compatibility with Django < 1.11
• Drop compatibility with Python 3 < 3.5

[codecov[bot]]

Codecov Report

Merging #34 into develop will decrease coverage by 1.25%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop      #34      +/-   ##
===========================================
- Coverage      100%   98.75%   -1.25%     
===========================================
  Files            8        8              
  Lines          160      160              
  Branches        15       15              
===========================================
- Hits           160      158       -2     
- Misses           0        2       +2

Impacted Files	Coverage Δ
djangocms_page_sitemap/cms_toolbars.py	95.12% <0%> (-4.88%)	:arrow_down:

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[codecov[bot]]

Codecov Report

Merging #34 into develop will not change coverage. The diff coverage is 100%.

@@          Coverage Diff           @@
##           develop    #34   +/-   ##
======================================
  Coverage      100%   100%           
======================================
  Files            8      8           
  Lines          160    157    -3     
  Branches        15     15           
======================================
- Hits           160    157    -3

Impacted Files	Coverage Δ
djangocms_page_sitemap/cms_toolbars.py	100% <100%> (ø)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 4902501...b876c80. Read the comment docs.