Added 'session' property to Puppeteer cookies.
Added 'session' property to Puppeteer cookies.

Sources:
https://github.com/GoogleChrome/puppeteer/blob/v1.4.0/docs/api.md#pagecookiesurls
https://chromedevtools.github.io/devtools-protocol/tot/Network#type-Cookie
borisyankov/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,AgentME/DefinitelyTyped,AgentME/DefinitelyTyped,borisyankov/DefinitelyTyped,AgentME/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,magny/DefinitelyTyped,mcliment/DefinitelyTyped,AgentME/DefinitelyTyped,magny/DefinitelyTyped