Add cy.trigger()

[chrisbreiding]

Create a cy.trigger() command that makes it easy to trigger an event on a dom element. This will help to simulate actions such as drag-n-drop, hover, and input range interaction.

cy.trigger() will take care of setting coordinates and sensible default properties such as cancelable and bubbles, allowing those properties to be overridden by the caller if needed.

[RandallKent]

The code for this is done, but this has yet to be released. We'll update the issue and reference the changelog when it's released.

[brian-mann]

Fixed in 0.20.0