Remove global logging modification

[clavin]

Summary

Removes the modification of the global loglevel methodFactory, as pointed out in #667

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #671 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #671      +/-   ##
==========================================
- Coverage   91.94%   91.92%   -0.02%     
==========================================
  Files           7        7              
  Lines         484      483       -1     
  Branches       90       90              
==========================================
- Hits          445      444       -1     
  Misses         22       22              
  Partials       17       17

Impacted Files	Coverage Δ
src/logger.ts	89.47% <100%> (-0.27%)	⬇️

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[aoberoi]

thanks @clavin!