update readme with future plans

[titusfortner]

@twalpole & @kapoorlakshya @luke-hill @p0deje

Does this sound like a reasonable plan for this project? Any suggestions/disagreements?

See merged text here: https://github.com/titusfortner/webdrivers#update-future-of-this-project

[titusfortner]

To avoid "me too," replies, please add a 👍 reaction to this comment if you need a solution to work with Selenium 3. That's the piece that I'm not sure I have time to address in the near term.

[twalpole]

Seems reasonable to me

[kapoorlakshya]

Sounds good to me and I like the plan for v6.