chore: mark version v1.0.0 (puppeteer#1786)

chore: mark version 0.13.0

chore: mark version 0.12.0

Mark version 0.11.0

Mark version 0.10.2

Mark version 0.10.1

Prepare to release (puppeteer#532)

- add node6-transform to .npmignore
- dump node version in sanity test

Roll chromium to r494755 (puppeteer#286)

Fixes puppeteer#285.