Fix typo in the developer docs for plugin manifest

[itaysk]

url should be uri

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[codecov-io]

Codecov Report

Merging #251 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #251   +/-   ##
======================================
  Coverage    53.6%   53.6%           
======================================
  Files          16      16           
  Lines         735     735           
======================================
  Hits          394     394           
  Misses        289     289           
  Partials       52      52

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[corneliusweig]

/retitle Fix typo in the developer docs for plugin manifest

[corneliusweig]

/lgtm
Thanks for fixing this!

[corneliusweig]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: corneliusweig, itaysk

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