Allow to provide a list of ignored words

[rixx]

For example, write-good doesn't know that "read-only" is a term, and tells me that "only" can weaken meaning. So if I'd be able to pass a "--ignore='read-only'", I'd be much more likely to run write-good on my API docs.

[RichardLitt]

Sounds like a good addition. I'd welcome a PR for this.

[blueyed]

Shouldn't "X-only" be whitelisted by default (at least "read-only" and "write-only")?
I.e. anything where "only" is not a sole word.

[RichardLitt]

@blueyed Most likely, yes.