fix linter (#136)
fix linter (#136)

This patch fixes broken travis, caused by impatient merge of f455e3a1e
GoogleChrome/puppeteer,GoogleChrome/puppeteer,ianchn/puppeteer,ianchn/puppeteer,puppeteer/puppeteer,michaelfward/puppeteer,puppeteer/puppeteer,GoogleChrome/puppeteer,brutalcrozt/puppeteer,a1ph/puppeteer,elisherer/puppeteer,brutalcrozt/puppeteer,michaelfward/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer,elisherer/puppeteer,a1ph/puppeteer