Feature: Add not version of filters where appropriate

[cortadocodes]

Contents

Minor fixes and improvements

• Add not version of filters where appropriate

Quality Checklist

• New features are fully tested (No matter how much Coverage Karma you have)

[codecov-io]

Codecov Report

Merging #66 (5c71467) into release/0.1.7 (0ef5fff) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@              Coverage Diff               @@
##           release/0.1.7      #66   +/-   ##
==============================================
  Coverage          96.22%   96.23%           
==============================================
  Files                 40       40           
  Lines                822      823    +1     
==============================================
+ Hits                 791      792    +1     
  Misses                31       31           

Impacted Files	Coverage Δ
octue/mixins/filterable.py	100.00% <100.00%> (ø)

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