[issue 558] Duplicate bot DM is being created when a user is mentioned on a PR assigned to the user

[sibasankarnayak]

added a check for duplicate notification.

ticket here Fixes #558

[mattermod]

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[mattermod]

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[codecov-commenter]

Codecov Report

Merging #559 (3fe1edc) into master (86db5ca) will decrease coverage by 0.02%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #559      +/-   ##
==========================================
- Coverage   15.54%   15.51%   -0.03%     
==========================================
  Files          15       15              
  Lines        4143     4151       +8     
==========================================
  Hits          644      644              
- Misses       3457     3465       +8     
  Partials       42       42              

Impacted Files	Coverage Δ
server/plugin/webhook.go	0.00% <0.00%> (ø)

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