removed unused handler function and added additional tests for handler

[gkspranger]

• src/yetibot/core/handler.clj

  • checked both core and YB repos and am not seeing this function used anywhere, so feel like it is safe to remove

• test/yetibot/core/test/handler.clj

  • added tests for (handle-raw)
  • a little tricky just because of its return value, but am able to verify internal meaningful function is called with expected value

[codecov[bot]]

Codecov Report

Merging #210 (67212b3) into master (941e56a) will increase coverage by 1.07%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #210      +/-   ##
==========================================
+ Coverage   60.52%   61.59%   +1.07%     
==========================================
  Files          95       95              
  Lines        4165     4164       -1     
  Branches      224      235      +11     
==========================================
+ Hits         2521     2565      +44     
+ Misses       1420     1364      -56     
- Partials      224      235      +11     

Impacted Files	Coverage Δ
src/yetibot/core/handler.clj	87.70% <ø> (+27.54%)	:arrow_up:
src/yetibot/core/observers/karma.clj	90.90% <0.00%> (ø)
src/yetibot/core/commands/observe.clj	23.96% <0.00%> (+1.65%)	:arrow_up:
src/yetibot/core/hooks.clj	89.90% <0.00%> (+8.25%)	:arrow_up:

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