Update handlebars to version 4.0.3 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

handlebars just published its new version 4.0.3, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of handlebars – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 118 commits .

• 9365b82 v4.0.3
• bf09177 Update release notes
• 94c840b Create data frame for @partial-block
• 861d6f7 Fix tests under IE
• fffb5a9 Fix iteration over undefined values
• 0878179 Allow for escaped ] characters in [] IDs
• 641fe33 Update travis to test node 0.12 and 4.0.0
• 733b7c8 Merge pull request #1091 from nikolas/patch-2
• 9a86e40 Merge pull request #1090 from nikolas/patch-1
• efad390 fix typo in release notes
• 3696d23 grammar fixes in 4.0.0 release notes
• a5a3ab0 v4.0.2
• c833541 Update release notes
• 7b1fdf8 Fix use of decorators within partials
• c7b28a6 v4.0.1

There are 118 commits in total. See the full diff.

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[fhemberger]

This update has to be tested, handling of contexts changed between Handlebars v3 and v4 (this could break some stuff).

[stevemao]

I believe the test coverage might not be enough. Handlebars v3 and v4 are quite different.

[fhemberger]

@stevemao We only test (parts) of our scripts at the moment, we don't have any integration/visual regression tests at all. That's why I wrote the comment.

[stevemao]

I can see that. I think it is a bit hard to merge this. The time we spend on testing this manually might be the same as adding the tests.

[fhemberger]

@nodejs/website To make sure the handlebars update doesn't break anything, I did a full build with v3.0.3 and diffed it to a build with 4.0.3 – luckily there were only three tiny changes necessary, so everything should be fine.

[fhemberger]

Ignore the failing test on Travis, standard is doing weird things again.

[phillipj]

Nicely tested @fhemberger 👍