noosfero | event: fix cache_key to update on new events (#626)

[Bráulio Bhavamitra]

New Merge Request #626

https://gitlab.com/noosfero/noosfero/merge_requests/626

Project:Branches: brauliobo/noosfero:event-cache-key to noosfero/noosfero:master
Author:    Bráulio Bhavamitra
Assignee:  

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