[Snyk] Upgrade rxjs from 5.0.0-beta.6 to 5.5.12#2

SDohle wants to merge 1 commit intomasterSDohle/angular2-webpack-starter:masterfrom

snyk-upgrade-1ac24a6b30504458853b4e97ff3e62a8SDohle/angular2-webpack-starter:snyk-upgrade-1ac24a6b30504458853b4e97ff3e62a8Copy head branch name to clipboard