Upgrade bundlesize to 0.13.2 #285

[siddharthkp]

What:
Upgrading bundlesize to 0.13.2

Why:
This update adds a better UI for multiple files: siddharthkp/bundlesize#55 (comment)

How:
Update version in package.json and yarn.lock

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[siddharthkp]

I signed it

[googlebot]

CLAs look good, thanks!

[brendankenny]

Thanks! New UI looks good

[paulirish]