added tests for util/config and core/hooks, small mod to core/hooks, comments

[gkspranger]

• core/hooks to use thread-last, easier to read
• comments for util/config
• new hooks/obs-hook test
• new tests for util/config

[codecov[bot]]

Codecov Report

Merging #162 (566e288) into master (55deb33) will increase coverage by 0.14%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
+ Coverage   46.29%   46.44%   +0.14%     
==========================================
  Files          94       94              
  Lines        4117     4119       +2     
  Branches      194      197       +3     
==========================================
+ Hits         1906     1913       +7     
+ Misses       2017     2009       -8     
- Partials      194      197       +3     

Impacted Files	Coverage Δ
src/yetibot/core/hooks.clj	77.98% <100.00%> (+0.41%)	:arrow_up:
src/yetibot/core/util/config.clj	54.83% <100.00%> (+20.35%)	:arrow_up:
src/yetibot/core/commands/observe.clj	14.04% <0.00%> (-0.71%)	:arrow_down:
src/yetibot/core/commands/collections.clj	40.18% <0.00%> (-0.19%)	:arrow_down:

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