Decoding intput files as utf8 after reading

[shizam]

Fixing a problem where utf-8 characters in the stone file break parsing.

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• Code Change
• Example/Test Code Change

Validation

• Have you ran tox?
• Do the tests pass?

[codecov]

Codecov Report

Merging #195 into master will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #195   +/-   ##
=======================================
  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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[greg-db]

Thanks!