Remove Deprecations

[davidhalter]

With this merged, I want to release 0.18.0.

[codecov-io]

Codecov Report

Merging #1711 (fa2d03a) into master (42a759a) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1711      +/-   ##
==========================================
+ Coverage   94.52%   94.64%   +0.11%     
==========================================
  Files          79       79              
  Lines       11762    11726      -36     
==========================================
- Hits        11118    11098      -20     
+ Misses        644      628      -16     

Impacted Files	Coverage Δ
jedi/api/classes.py	98.28% <ø> (+3.14%)	⬆️
jedi/__init__.py	100.00% <100.00%> (ø)
jedi/api/__init__.py	97.59% <100.00%> (+1.64%)	⬆️
jedi/inference/value/module.py	99.27% <0.00%> (+0.06%)	⬆️

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[PeterJCLaw]

Nice :)