noosfero | gemfile: fix warnings (!1431)

[Rodrigo Souto]

Merge Request !1431 was merged
Merge Request url: https://gitlab.com/noosfero/noosfero/merge_requests/1431
Project:Branches: diguliu/noosfero:fix-warnings to noosfero/noosfero:master
Author: Rodrigo Souto
Assignee: Rodrigo Souto

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