Reduce the import path to the loop tool

[k1nshuk]

Address #16 with a shorter way to import loop tool in parameter sweep. now one can simply call:

from parameter_sweep import loopTool

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.35%. Comparing base (f7e90b3) to head (794e658).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   94.34%   94.35%           
=======================================
  Files          37       38    +1     
  Lines        3716     3718    +2     
=======================================
+ Hits         3506     3508    +2     
  Misses        210      210           

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