Update to relative plugin action paths.

[scottleedavis]

• Issue Mattermost webhook plugin post error - dail tcp i/o error #148

[codecov]

Codecov Report

Merging #150 into master will increase coverage by 0.07%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
+ Coverage   53.46%   53.53%   +0.07%     
==========================================
  Files          12       12              
  Lines        3034     3024      -10     
==========================================
- Hits         1622     1619       -3     
+ Misses       1203     1200       -3     
+ Partials      209      205       -4

Impacted Files	Coverage Δ
server/plugin.go	100% <ø> (ø)	⬆️
server/activate.go	61.53% <ø> (+1.16%)	⬆️
server/http.go	39.62% <0%> (ø)	⬆️
server/reminder.go	21.06% <0%> (+0.17%)	⬆️
server/scheduler.go	77.85% <100%> (ø)	⬆️
server/list.go	51.02% <33.33%> (-0.44%)	⬇️
server/occurrence.go	58.49% <0%> (+0.24%)	⬆️

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