Pass ctx to transporter

[roark]

Enables more verbose Transporter to log other ctx details. Fixes issues #77 and #82.

ctx is passed as the 3rd argument to transporter as to not disrupt any existing code. That said, it could easily be the first argument if desired.

app.use(logger((str, args, ctx) => {
  console.log(str, ctx.request.ip); // ctx.request.header['user-agent'], etc...
}))

[s4kr4]

When does it ship?

[libook]

Anyone who waiting for this feature may do this temporarily:

import koaLogger from "koa-logger";

app.use(async (ctx, next) => {
    const koaLoggerInstance = koaLogger(logString => {
        // Do anything with ctx
    });
    await koaLoggerInstance(ctx, next);
});