handle panic

[hidetatz]

WHAT

Handle panic in Print. When recover(), uncolored output will be shown.

WHY

When "kubecolor plugin_name version" or so on is specified, is should not colorize because kubecolor does not support plugins.
However, right now, kubecolor thinks "plugin_name" is a command-line option and the subcommand is "version" (= "kubectl version"). Then, VersionPrinter is called but it fail to parse then panic.

Ideally, it should understand if the given command is running plugin or not, but it seems like it is likely impossible.
This is just a workaround to "accept" mis parsing and panic.

Related issue (if exists)

#68

[codecov-commenter]

Codecov Report

Merging #69 (1db9c95) into main (330bb02) will decrease coverage by 0.55%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
- Coverage   84.34%   83.78%   -0.56%     
==========================================
  Files          18       18              
  Lines         594      592       -2     
==========================================
- Hits          501      496       -5     
- Misses         84       88       +4     
+ Partials        9        8       -1     

Impacted Files	Coverage Δ
command/runner.go	0.00% <0.00%> (ø)
command/subcommand.go	84.00% <ø> (+6.22%)	⬆️
kubectl/subcommand.go	90.62% <ø> (-0.68%)	⬇️

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