needs to new koa const for koa v 2 to work

[emcwilliams]

I was just reading through your tutorial in the Google App Engine kao intro and ran into Koa v2 requiring the "new" statement. Just wanted to give you the info to help out on the documentation. This doesn't look like the same code as in the example but maybe the message will reach you and I can sleep tonight knowing I helped fix something today :D

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[jmdobry]

Is this supposed to replace the line above it?

[fhinkel]

@emcwilliams Thanks for the PR! Do you want to make the requested changes?