Update to puppeteer v2.0.0

[lipp]

PR created by bot:
#94

[akrawchyk]

@toolmantim is this a priority? The docker image is one major version release behind puppeteer upstream and 5 minor releases behind.

[toolmantim]

Sorry those versions weren't being published properly. We've just published a new version, but no v2.0.0 I'm afraid — straight to v3.0.1, and fixed it up so the automated builds are working correctly again.

[akrawchyk]

nice, thanks @toolmantim!