[wp-trac] [WordPress Trac] #47478: Update Backbone.js to 1.4.0

[WordPress Trac]

#47478: Update Backbone.js to 1.4.0
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 Reporter:  desrosj                           |       Owner:  (none)
     Type:  task (blessed)                    |      Status:  new
 Priority:  normal                            |   Milestone:  5.3
Component:  External Libraries                |     Version:
 Severity:  normal                            |  Resolution:
 Keywords:  needs-patch early good-first-bug  |     Focuses:
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Changes (by priyankkpatel):

 * Attachment "backbone.js" added.

 backbone.js 1.4.0

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Ticket URL: <https://core.trac.wordpress.org/ticket/47478>
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