remove chimera build tag

[flier]

resolve #59

[codecov]

Codecov Report

Attention: Patch coverage is 57.89474% with 8 lines in your changes missing coverage. Please review.

Project coverage is 51.34%. Comparing base (6657c9a) to head (bd57fbb).
Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
chimera/scratch.go	16.66%	5 Missing ⚠️
chimera/api.go	0.00%	1 Missing ⚠️
chimera/compile.go	85.71%	1 Missing ⚠️
hyperscan/pattern.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #65       +/-   ##
===========================================
- Coverage   62.07%   51.34%   -10.73%     
===========================================
  Files          34       36        +2     
  Lines        1777     2152      +375     
===========================================
+ Hits         1103     1105        +2     
- Misses        551      924      +373     
  Partials      123      123               

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