FIX: adds missing entries in .gitignore

[shreyaa-s-zz]

fixes #422

adds .vscode in .gitignore
adds _SpecRunner.html in .gitignore

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[welcome]

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Please make sure you've bumped up the version number in the repository's package.json file and that you've incorporated your changes in the /dist/ sub-directory.
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[shreyaa-s-zz]

@jywarren Hey i dont know why the checks are failing. I only made changes in the .gitignore file. Can you please help me out? Thanks.

[cesswairimu]

Thanks everyone 🎉