Bump version number to v0.6.1

[wxh06]

• Change OFNF (Output File Not Found) to ONF (Output Not Found)

[codecov]

Codecov Report

Merging #11 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #11   +/-   ##
=======================================
  Coverage   97.11%   97.11%           
=======================================
  Files           2        2           
  Lines         104      104           
=======================================
  Hits          101      101           
  Misses          3        3

Impacted Files	Coverage Δ
tests.py	100% <100%> (ø)	⬆️
dockerjudge/__init__.py	95.38% <100%> (ø)	⬆️

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