fixed to call janitor run method

[Code-Hex]

#26 (comment)

[codecov]

Codecov Report

Merging #27 (9790bda) into main (52983e9) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #27   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          524       520    -4     
=========================================
- Hits           524       520    -4     

Impacted Files	Coverage Δ
janitor.go	100.00% <ø> (ø)
cache.go	100.00% <100.00%> (ø)

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[Code-Hex]

Previously, the janitor held in New was not stopped because SetFinalizer was not called. Therefore I have changed the specification in 9790bda.

I explain here why it is not stopped.

1. The janitor is stopped when the cache is not referenced anywhere.
2. The cache is referenced in the janitor run method.
3. The cache is always referenced. So It will be not called a finalizer.

If you want to stop the janitor gracefully, You must use the NewContext function.