Allow utf8 files for json and yaml configs

[ngudkov]

[codecov[bot]]

Codecov Report

Merging #16 (f34b3cd) into master (116c4bc) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #16   +/-   ##
=======================================
  Coverage   90.85%   90.85%           
=======================================
  Files          18       18           
  Lines         536      536           
  Branches      103      103           
=======================================
  Hits          487      487           
  Misses         39       39           
  Partials       10       10           

Impacted Files	Coverage Δ
config42/handlers/files/json.py	100.00% <100.00%> (ø)
config42/handlers/files/yaml.py	84.61% <100.00%> (ø)

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