Automatically fix double-quoted strings

[ryanjulian]

• Turns on a pre-commit rule to automatically replace double-quote strings with single-quote strings, per CONTRIBUTING.md
• Updates .pre-commit-config.yml to latest version from rlworkgroup/garage and rlworkgroup/viskit

[codecov[bot]]

Codecov Report

Merging #21 into master will increase coverage by 1.27%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
+ Coverage    71.3%   72.58%   +1.27%     
==========================================
  Files          17       17              
  Lines         359      394      +35     
==========================================
+ Hits          256      286      +30     
- Misses        103      108       +5

Impacted Files	Coverage Δ
src/akro/tf/box.py	55.55% <0%> (-1.59%)	:arrow_down:
src/akro/theano/box.py	80% <0%> (ø)	:arrow_up:
src/akro/box.py	83.11% <0%> (+3.52%)	:arrow_up:

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