Probot postpublish is not executed as expected

[MaximDevoir]

Bug Report

Current Behavior

semantic-release publishes a module to NPM, but after, the postpublish script to update probot.github.io is not called. ( see the most recent release logs)

Expected behavior/code

Expected probot.github.io to be updated.

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[MaximDevoir]

Closing in favor of probot/probot.github.io#321.