[Snyk] Upgrade backbone from 1.1.0 to 1.4.0

[snyk-bot]

Snyk has created this PR to upgrade backbone from 1.1.0 to 1.4.0.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 10 versions ahead of your current version.
• The recommended version was released 3 years ago, on 2019-02-19.

Release notes

Package name: backbone

• 1.4.0 - 2019-02-19

  Backbone 1.4.0

• 1.3.3 - 2016-04-05

  Create 1.3.3 Release

• 1.3.2 - 2016-03-12

  Backbone 1.3.2

• 1.3.1 - 2016-03-04

  Because I screwed up the 1.3.0 release by not building the min files...
  Sorry everyone.

• 1.2.3 - 2015-09-03

  Backbone.js 1.2.3

• 1.2.2 - 2015-08-19

  Backbone.js 1.2.2

• 1.2.1 - 2015-06-04

  Backbone 1.2.1

• 1.2.0 - 2015-05-13

  Backbone.js 1.2.0 (I think)

• 1.1.2 - 2014-02-20
• 1.1.1 - 2014-02-13
• 1.1.0 - 2013-10-11

from backbone GitHub release notes

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