chore: another attempt to fix pptr@next (#3210)
chore: another attempt to fix pptr@next (#3210)

It turns out that travis runs commands in sh rather then in bash.

Fixes #2925.
puppeteer/puppeteer,GoogleChrome/puppeteer,puppeteer/puppeteer,GoogleChrome/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer,GoogleChrome/puppeteer