Modernize the code

[gdubicki]

• Update syntax to Python 3.7+ with pyupgrade
• Format with black

[codecov]

Codecov Report

Base: 84.88% // Head: 84.49% // Decreases project coverage by -0.39% ⚠️

Coverage data is based on head (0e4cc8d) compared to base (05dc619).
Patch coverage: 75.19% of modified lines in pull request are covered.

❗ Current head 0e4cc8d differs from pull request most recent head 3a2b2d2. Consider uploading reports for the commit 3a2b2d2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #235      +/-   ##
==========================================
- Coverage   84.88%   84.49%   -0.40%     
==========================================
  Files          14       14              
  Lines         913      890      -23     
==========================================
- Hits          775      752      -23     
  Misses        138      138              

Impacted Files	Coverage Δ
pypuppetdb/api/metadata.py	75.00% <0.00%> (-5.00%)	⬇️
pypuppetdb/errors.py	100.00% <ø> (ø)
pypuppetdb/api/query.py	54.43% <45.83%> (-1.13%)	⬇️
pypuppetdb/types.py	70.07% <51.13%> (-0.23%)	⬇️
pypuppetdb/utils.py	93.75% <80.00%> (-0.70%)	⬇️
pypuppetdb/api/pql.py	85.00% <90.90%> (-0.49%)	⬇️
pypuppetdb/QueryBuilder.py	97.09% <95.00%> (-0.03%)	⬇️
pypuppetdb/__init__.py	100.00% <100.00%> (ø)
pypuppetdb/api/base.py	98.42% <100.00%> (-0.03%)	⬇️
pypuppetdb/api/command.py	94.11% <100.00%> (-0.33%)	⬇️
... and 3 more

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