re-org'ed and added tests for both core.adapters and core.adapters.adapter, with small changes to src to make more idiotmatic

[gkspranger]

• made kondo more happy by removing non-used :require deps
• made small changes to src ((run!) vs (dorun (map))) to make codeclimate happy
• added some doc strings (<< not much value add here as function names were pretty obvious)
• tests added for core.adapters
  • some of this was taking from other tests where core.adapters was being tested
  • migrated some tests to midje
• created tests for core.adapters.adapter
• dropped a test file (web) that had no tests

[codecov[bot]]

Codecov Report

Merging #177 (cb19ca8) into master (9f859de) will increase coverage by 0.96%. The diff coverage is 31.25%.

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
+ Coverage   50.38%   51.35%   +0.96%     
==========================================
  Files          94       94              
  Lines        4132     4132              
  Branches      195      197       +2     
==========================================
+ Hits         2082     2122      +40     
+ Misses       1855     1813      -42     
- Partials      195      197       +2     

Impacted Files	Coverage Δ
src/yetibot/core/adapters.clj	56.81% <21.42%> (+21.26%)	:arrow_up:
src/yetibot/core/adapters/adapter.clj	84.61% <100.00%> (+17.94%)	:arrow_up:
src/yetibot/core/adapters/irc.clj	27.69% <0.00%> (+0.46%)	:arrow_up:
src/yetibot/core/adapters/slack.clj	23.47% <0.00%> (+2.31%)	:arrow_up:
src/yetibot/core/adapters/mattermost.clj	19.71% <0.00%> (+7.51%)	:arrow_up:
src/yetibot/core/adapters/web.clj	34.48% <0.00%> (+10.34%)	:arrow_up:

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