[skip travis] DEV: Remove Non-Blocking Pre-Commit Checks

[John-P]

Make spelling checks a blocking pre-commit issue again and sort pre-commit flake8 dependency lines to be alphabetical

[John-P]

@shaneahmed Please review and merge if you are happy with this.

[shaneahmed]

Please can you add how to ignore code complexity in the description for this PR?
We can then merge it.

[codecov]

Codecov Report

Merging #168 (32bbd56) into develop (e718398) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #168      +/-   ##
===========================================
- Coverage    99.92%   99.82%   -0.11%     
===========================================
  Files           40       40              
  Lines         2751     3382     +631     
  Branches       458      605     +147     
===========================================
+ Hits          2749     3376     +627     
  Misses           1        1              
- Partials         1        5       +4     

Impacted Files	Coverage Δ
tiatoolbox/models/architecture/vanilla.py	100.00% <100.00%> (ø)
tiatoolbox/models/controller/semantic_segmentor.py	100.00% <100.00%> (ø)
tiatoolbox/utils/transforms.py	100.00% <100.00%> (ø)
tiatoolbox/wsicore/wsireader.py	99.52% <0.00%> (-0.48%)	⬇️
tiatoolbox/wsicore/wsimeta.py	100.00% <0.00%> (ø)
tiatoolbox/models/dataset/classification.py	100.00% <0.00%> (ø)

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