Update dependency chart.js to v2.9.4

[staging-whitesource-for-github-com]

This PR contains the following updates:

Package	Type	Update	Change
chart.js (source)	dependencies	patch	2.9.3 -> 2.9.4

By merging this PR, the issue #7 will be automatically resolved and closed:

Severity	CVSS Score	CVE
High	7.5	CVE-2020-7746

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Release Notes

chartjs/Chart.js (chart.js)

v2.9.4

Compare Source

This is the last release of v2 and focused on fixing bugs identified in the v2.9.3 release.

Bugs Fixed

• #​7404 - Preserve prototypes when cloning. Thanks @​iddings
• #​7587 - Fix docs for external moment.js. Thanks @​mojoaxel
• #​7853 - Fix box recursion when dimensions are NaN. Thanks @​alessandroasm
• #​7883 - Fix call stack exception when computing label sizes. Thanks @​silentmatt
• #​7918 - Prevent global prototype pollution via the merge helper
• #​7920 - Use Object.create(null) as merge target, to prevent prototype pollution

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