UPDATE: www/kibana 5.5.1 => 5.6.3

Dear all,
Please find an update for www/kibana attached.

Announce: https://www.elastic.co/blog/kibana-5-6-3-released
Release Notes:
https://www.elastic.co/guide/en/kibana/5.6/release-notes-5.6.3.html

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With best regards,
Pavel Korovin