Revert "Decoding intput files as utf8 after reading"

[karandeep-johar]

Reverts #195

seeing errors like

specs.append((spec_path, f.read().decode('utf8')))
AttributeError: 'str' object has no attribute 'decode'

[codecov]

Codecov Report

Merging #196 into master will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #196   +/-   ##
=======================================
  Coverage   51.17%   51.17%           
=======================================
  Files          37       37           
  Lines        8351     8351           
  Branches     1781     1781           
=======================================
  Hits         4274     4274           
  Misses       3757     3757           
  Partials      320      320           

Flag	Coverage Δ
#unit	51.17% <0.00%> (ø)

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Impacted Files	Coverage Δ
stone/cli.py	0.00% <0.00%> (ø)

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