add inspectdb test

[shimizukawa]

Feature or Bugfix

• Feature & Bugfix

Purpose

• test with real database for inspectdb feature that fixed by #90

• 90 is not worked with dj22 and 31, so this PR fixes it.

Relates

• 90

[codecov[bot]]

Codecov Report

Merging #95 (f33c35d) into master (58981ac) will increase coverage by 1.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   51.42%   52.44%   +1.01%     
==========================================
  Files           3        3              
  Lines         280      286       +6     
  Branches       79       80       +1     
==========================================
+ Hits          144      150       +6     
  Misses        125      125              
  Partials       11       11              

Impacted Files	Coverage Δ
django_redshift_backend/base.py	49.62% <100.00%> (+1.14%)	:arrow_up:

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