Bump gon from 6.2.1 to 6.4.0

[dependabot[bot]]

Bumps gon from 6.2.1 to 6.4.0.

Changelog

Sourced from gon's changelog.

[6.4.0] - 2020-09-18

Security

• CVE-2020-25739: Enforce HTML entities escaping in gon output

[6.3.2] - 2019-11-18

Security

• Restrict possibility of vulnerable i18n legacy verision (0.3.6.pre) installation

[6.3.1] - 2019-11-18

Changed

• ActionView::Base and ActionController::Base should be loaded inside ActiveSupport.on_load hook. Thanks to @​amatsuda
• Require Ruby >= 2.2.2 (activesupport). Thanks to @​nicolasleger
• Update old_rails.rb to reflect GonHelpers -> ControllerHelpers name change. Thanks to @​etipton

Commits

• fe3c7b2 CVE-2020-25739: Enforce HTML entities escaping in gon output
• 9924c70 Merge pull request #260 from oieioi/ruby-2.7
• a067b56 Fix kwargs usage for Ruby 2.7
• e5bbbd8 Update changelog
• 5894a19 Bump version to 6.3.2
• c99d7eb Restrict possibility of vulnerable dependency installation
• a1eec56 Add unreleased section to changelog
• 539c14d Format changelog
• 9b6472a Restrict to use gon with non-stable rails 3
• c811e3c Add security contact
• Additional commits viewable in compare view

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