Specify encoding when opening file

[cbh34680]

[codecov[bot]]

Codecov Report

Merging #161 (7de70d5) into master (a29b4f9) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #161   +/-   ##
=======================================
  Coverage   95.97%   95.97%           
=======================================
  Files          18       18           
  Lines         547      547           
  Branches      103      103           
=======================================
  Hits          525      525           
  Misses         12       12           
  Partials       10       10           

Impacted Files	Coverage Δ
openapi_spec_validator/handlers/file.py	100.00% <100.00%> (ø)

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