Fixing dangling comma on package.json

[bernardodomingues-hotmart]

The original file was an invalid JSON, which could potentially break builds that would parse JSON files. Fixes #2810

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[Feiyang1]

@bernardodomingues-hotmart Thanks for the fix. Can you please sign the CLA?

[bernardodomingues-hotmart]

@googlebot I signed it!

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[bernardodomingues-hotmart]

@Feiyang1 There you go