feat: remove spy()

[unional]

It does not really belongs to this package.
It is moved to komondor

[codecov]

Codecov Report

Merging #32 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #32   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      6    -3     
  Lines         163     76   -87     
  Branches       36     22   -14     
=====================================
- Hits          163     76   -87

Impacted Files	Coverage Δ
src/index.ts	100% <ø> (ø)	⬆️

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[coveralls]

Coverage increased (+0.4%) to 100.0% when pulling faf2796 on remove-spy into 4353eed on master.

[coveralls]

Coverage increased (+0.4%) to 100.0% when pulling faf2796 on remove-spy into 4353eed on master.