Custom attributes

[greggb]

This is a handy plugin. I use a couple of different attrs to test that would be nice to remove, so I thought it would be a good option to pass in.

state.opts is always an empty object if nothing is passed in.

[coveralls]

Coverage remained the same at 100.0% when pulling 02366d0 on greggb:custom-attributes into 3ca3730 on kutyel:master.

[kutyel]

Hi, first of all, thank you very much for your PR!

Initially I didn't want to merge this because there is already another plugin to remove any attribute, even though it is not very used I didn't want to duplicate plugins.

I think the differentiating factor between both is the default case, data-test-id which seems to be pretty common, and the fact that without configuring the plugin you can just drop it and it starts working. Also, the naming of the plugin is quite representative which I think is something in my favour 😉

I'm merging it with some changes to the code because I think either way having the ability to customize something is always great! 👍

[coveralls]

Coverage remained the same at 100.0% when pulling dd82c07 on greggb:custom-attributes into 3ca3730 on kutyel:master.

[coveralls]

Coverage remained the same at 100.0% when pulling 039b67e on greggb:custom-attributes into 3ca3730 on kutyel:master.

[greggb]

No worries. Thanks for pulling it in!