Deprecate ioutil

[OldPanda]

As mentioned in the document,

Deprecated: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.66%. Comparing base (3642c53) to head (f2e0a47).

Additional details and impacted files

@@            Coverage Diff             @@
##           pre-1.0.0      #14   +/-   ##
==========================================
  Coverage      91.66%   91.66%           
==========================================
  Files              3        3           
  Lines            168      168           
==========================================
  Hits             154      154           
  Misses             8        8           
  Partials           6        6           

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