Bump handlebars from 4.0.8 to 4.3.1

[dependabot]

Bumps handlebars from 4.0.8 to 4.3.1.

Changelog

Sourced from handlebars's changelog.

v4.3.1 - September 25th, 2019

Fixes:

• do not break on precompiled templates from Handlebars >=4.0.0 <4.3.0 - 1266838, #1561
• Ensure allowCallsToHelperMissing runtime option is optional in typings - 93444c5, 64ecb9e, #1560

Commits

v4.3.0 - September 24th, 2019

Fixes:

• Security: Disallow calling "helperMissing" and "blockHelperMissing" directly - 2078c72
• Disallow calling "helperMissing" and "blockHelperMissing" directly - 2078c72

Features:

• Add new runtime option allowCallsToHelperMissing to allow calling blockHelperMissing and helperMissing.

Breaking changes:

Compatibility notes:

• Compiler revision increased - 06b7224

  • This means that template compiled with versions prior to 4.3.0 will not work with runtimes >= 4.3.0
    The increase was done because the "helperMissing" and "blockHelperMissing" are now moved from the helpers
    to the internal "container.hooks" object, so old templates will not be able to call them anymore. We suggest
    that you always recompile your templates with the latest compiler in your build pipelines.

• Disallow calling "helperMissing" and "blockHelperMissing" directly - 2078c72

  • Calling "helperMissing" and "blockHelperMissing" directly from a template (like in {{blockHelperMissing}} was
    never intended and was part of the exploits that have been revealed early in 2019
    (see https://github-redirect.dependabot.com/wycats/handlebars.js/issues/1495). It is also part of a new exploit that
    is not captured by the earlier fix. In order to harden Handlebars against such exploits, calling thos helpers
    is now not possible anymore. Overriding those helpers is still possible.
  • If you really need this behavior, you can set the runtime option allowCallsToHelperMissing to true and the
    calls will again be possible

Both bullet points imly that Handlebars is not 100% percent compatible to 4.2.0, despite the minor version bump.

We consider it more important to resolve a major security issue than to maintain 100% compatibility.

Commits

v4.2.1 - September 20th, 2019

Bugfixes:

• The "browser" property in the package.json has been updated to use the common-js builds instead of the minified UMD - c55a7be, #1553

... (truncated)

Commits

• 050cca0 v4.3.1
• 2d55790 Update release notes
• e3639e2 fix saucelabs tests (internet explorer)
• c2a17c7 fix saucelabs tests (internet explorer)
• 1266838 do not break on precompiled templates from Handlebars >=4.0.0 <4.3.0
• 64ecb9e add test for #1560
• 93444c5 Ensure allowCallsToHelperMissing runtime option is optional in typings
• d148d7c check "allowCallsToHelperMissing"
• a89081d v4.3.0
• bba6560 Update release notes
• Additional commits viewable in compare view

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