Remove usage of deprecated io/ioutil and upgrade to Go 1.16

[stephenafamo]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (025ca0c) 82.46% compared to head (b276b8e) 82.46%.

Files	Patch %	Lines
v2/goi18n/merge_command.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #308   +/-   ##
=======================================
  Coverage   82.46%   82.46%           
=======================================
  Files          15       15           
  Lines        1186     1186           
=======================================
  Hits          978      978           
  Misses        145      145           
  Partials       63       63           

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