npm's koa-kwt@latest is v2 branch

[sdd]

I've just been reading Koa's v2 roadmap, and spotted this:

All of the current stable versions of middleware should be targeting koa v1. If it doesn't, let us know and we'll fix it.

Middleware may have an "alpha" version of the koa v2 version. These should NOT be marked as stable. If they do not exist, let us know and we'll create an alpha version so you can try it with koa v2. Better yet, make a PR!

Unfortunately my recent npm publish of v2 had dist-tag latest, so if someone starts a new empty project and runs npm install koa koa-jwt, they will end up with koa v1.2.4 and koa-jwt v2.2.1 😢 Consider this minimal example script in that environment:

const koa = require('koa');
const jwt = require('koa-jwt');

const app = koa();
app.use(jwt({ secret: 'shhh' }));
app.listen(3000);

This dies with AssertionError: app.use() requires a generator function. Sorry if anyone has been affected, it's my fault. I'll republish the 1.x branch ASAP with the latest tag to correct this.

For the v2 branch we should probably do what Koa does. This means that an npm publish on v2 will have the right tag automatically.

[sdd]

Resolved.