Optimize VEGAS map's efficiency

[houpc]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.76404% with 10 lines in your changes missing coverage. Please review.

Project coverage is 90.59%. Comparing base (5749a52) to head (14276cf).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
MCintegration/maps.py	87.50%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   90.66%   90.59%   -0.07%     
==========================================
  Files          10       10              
  Lines        1210     1223      +13     
==========================================
+ Hits         1097     1108      +11     
- Misses        113      115       +2     

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