check rule on issue

[SimonLab]

see #58 This PR:

• check for breaking rule on issue for label "in-progress" with no assignees
• wait 30s and check the status of the issue again
• Add a comment on the issue to notify the user

[codecov[bot]]

Codecov Report

Merging #60 into master will increase coverage by 3.12%. The diff coverage is 88.46%.

@@            Coverage Diff            @@
##           master     #60      +/-   ##
=========================================
+ Coverage   84.37%   87.5%   +3.12%     
=========================================
  Files           8      11       +3     
  Lines          32      56      +24     
=========================================
+ Hits           27      49      +22     
- Misses          5       7       +2

Impacted Files	Coverage Δ
web/router.ex	100% <ø> (+50%)	:arrow_up:
web/controllers/event_controller.ex	100% <100%> (ø)
web/controllers/installation_controller.ex	100% <100%> (ø)	:arrow_up:
web/controllers/github_api/in_memory.ex	100% <100%> (ø)
web/controllers/rules/rules.ex	66.66% <66.66%> (ø)

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[SimonLab]

I have deploy this PR on heroku to test it, https://dwylbot.herokuapp.com so you can play with it too. If you create an event on an issue (new issue, change labels, new assignee...) dwylbot will add a comment after 30s to let you know that you need to correct the issue (it it's wrong)