Add clear to cache with mutex lock when clearing

[bir]

No description provided.

[codecov]

Codecov Report

Merging #28 (6208fb3) into master (f8cfc2b) will decrease coverage by 0.07%.
The diff coverage is 85.71%.

❗ Current head 6208fb3 differs from pull request most recent head 3a9fa7f. Consider uploading reports for the commit 3a9fa7f to get more accurate results

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   98.10%   98.03%   -0.07%     
==========================================
  Files          29       29              
  Lines        1266     1272       +6     
==========================================
+ Hits         1242     1247       +5     
- Misses         16       17       +1     
  Partials        8        8              

Files Changed	Coverage Δ
cache/noop.go	88.88% <0.00%> (-11.12%)	⬇️
cache/basic.go	100.00% <100.00%> (ø)

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