Add newline so bitbucket formats markdown

[lkysow]

Fixes #604

Bitbucket's custom markdown renderer :shakesfistat:

[codecov]

Codecov Report

Merging #605 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #605   +/-   ##
=======================================
  Coverage   72.15%   72.15%           
=======================================
  Files          61       61           
  Lines        4629     4629           
=======================================
  Hits         3340     3340           
  Misses       1044     1044           
  Partials      245      245

Impacted Files	Coverage Δ
server/events/markdown_renderer.go	92.4% <ø> (ø)	⬆️

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