tests for core.loader.clj and small change

[gkspranger]

• added new midje tests for loader.clj
• replaced existing clojure.test with midje tests
• found an odd issue where namespaces were being "double loaded" because dups of namespaces were being returned via the find-namespaces function .. not entirely sure why, so running distinct over list before returning

🤞

[codecov[bot]]

Codecov Report

Merging #157 (8a1ed7e) into master (ec12947) will increase coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #157      +/-   ##
==========================================
+ Coverage   45.76%   45.81%   +0.04%     
==========================================
  Files          94       94              
  Lines        4099     4099              
  Branches      196      196              
==========================================
+ Hits         1876     1878       +2     
+ Misses       2027     2025       -2     
  Partials      196      196              

Impacted Files	Coverage Δ
src/yetibot/core/loader.clj	67.21% <0.00%> (+3.27%)	:arrow_up:

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