fix: add force option to invalidate callback

[bennypowers]

Fixes #166

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[coveralls]

Coverage remained the same at 100.0% when pulling f25790a on bennypowers:fix/force-invalidate into 1a7ab52 on hybridsjs:master.

[smalluban]

Hi @bennypowers! Look promising, It might help binding with external libraries. I like idea to mix up arguments of cache.invalidate() to one options object with clearValue, deleteValue -> deleteEntry and new force. However, it will require updating places where cache is used. Also, we need to update types/index.d.ts according to the changes.

Are you willing to do that, or should I merge your PR to the working branch and continue changes?

[bennypowers]

I'll give it a shot just now, I've got the repo up and running locally. I have to step out in a few hours, so I'll push what I have at that time and ping you on gitter.

Thanks for the review!

[bennypowers]

@smalluban latest commit combines options into a single object. I only documented the force option, since I'm not sure how to explain the other two, or whether you wish them to be public. If you want, please add some docs to the table, or alternatively, remove them from the typescript declaration, or just leave it as-is if you like

[bennypowers]

Side note: this options object could be expanded in the future, e.g. a sync option

[bennypowers]

I implemented those suggestions but test fail now, can you take a look?