1.6.0

• Add puppeteer.connect to connect to an existing Chromium instance
• Add slowMo parameter for puppeteer.launch et puppeteer.connect to slow down communications with the browser.
• Create Worker from service_worker and shared_worker.
• Use a default viewport of 1280x1024 by default (allow to pass null to disable the default).
• Add a small "plugin" system
• Add the StealthPlugin to automatically applies various techniques to make detection of headless puppeteer harder.
• Add Page.clickAndWaitForNavigation for convenience.
• Add Page.coverage feature
• Add Page.metrics feature
• Add Page.tracing feature