Bugfix: support Object.create(null)

[ryan-roemer]

• Allow use of Object.create(null) to work without error. Fixes #64
• Add customized tests.

[codecov-commenter]

Codecov Report

Merging #123 (3f368f5) into master (b34988f) will not change coverage. The diff coverage is 100.00%.

:exclamation: Current head 3f368f5 differs from pull request most recent head 73bdc95. Consider uploading reports for the commit 73bdc95 to get more accurate results

@@           Coverage Diff           @@
##           master     #123   +/-   ##
=======================================
  Coverage   98.21%   98.21%           
=======================================
  Files           1        1           
  Lines          56       56           
=======================================
  Hits           55       55           
  Misses          1        1           

Impacted Files	Coverage Δ
index.js	98.21% <100.00%> (ø)

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[ryan-roemer]

Released in react-fast-compare@3.2.1