Fix locking mechanism in Lookup function

[imu2008]

Fix locking mechanism in Lookup method by changing RLock to RUnlock for proper read lock release

[lestrrat]

@imu2008 oh oops. Thanks!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.47%. Comparing base (b0b9070) to head (731df93).
⚠️ Report is 22 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   81.75%   83.47%   +1.72%     
==========================================
  Files           7        5       -2     
  Lines         411      351      -60     
==========================================
- Hits          336      293      -43     
+ Misses         60       43      -17     
  Partials       15       15              

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