fix(getCommand): update regular expression to check command carefully

[evenchange4]

for issue #13

[codecov]

Codecov Report

Merging #14 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #14   +/-   ##
=======================================
  Coverage   97.61%   97.61%           
=======================================
  Files           6        6           
  Lines          42       42           
  Branches        2        2           
=======================================
  Hits           41       41           
  Misses          1        1

Impacted Files	Coverage Δ
src/utils/getCommand.js	100% <100%> (ø)	⬆️
src/listener.js	94.73% <100%> (ø)	⬆️

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