Make Chromedriver truly headless (#982)
Make Chromedriver truly headless (#982)

* Make Chromedriver truly headless

When I use Suspenders' configuration on a new project, JavaScript tests
open up the Chrome app in a real window.

When using the configuration in this commit, Chrome quietly bounces
once, in the taskbar (on macOS), and does not create a window.

* Remove needless Chromedriver options

thoughtbot/suspenders,delphaber/suspenders,thoughtbot/suspenders,welaika/welaika-suspenders,delphaber/suspenders,thoughtbot/suspenders,delphaber/suspenders,welaika/welaika-suspenders,welaika/welaika-suspenders