docs: add "why is this not express 4.0" to FAQ

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TJ Holowaychuk 2013-12-19 08:56:41 -08:00
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No - out of the box Koa has no form of routing, however No - out of the box Koa has no form of routing, however
many routing middleware are available: https://github.com/koajs/koa/wiki many routing middleware are available: https://github.com/koajs/koa/wiki
## Why isn't Koa just Express 4.0?
Koa is a pretty large departure from what people know about Express,
the design is fundamentally much different, so the migration from
Express 3.0 to this Express 4.0 would effectively mean rewriting
the entire application, so we thought it would be more appropriate
to create a new library.