[MacPorts] #57397: zsh @5.5.1_1: update to 5.6.2

[MacPorts]

#57397: zsh @5.5.1_1: update to 5.6.2
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 Reporter:  tgyurci  |      Owner:  larryv
     Type:  update   |     Status:  assigned
 Priority:  High     |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  zsh
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 Zsh 5.6.2 was released on 2018. Sep. 14.
 It contains security fixes:

 http://zsh.sourceforge.net/Arc/source.html

 http://www.zsh.org/mla/zsh-announce/136

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Ticket URL: <https://trac.macports.org/ticket/57397>
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