Goa introduction breaks

Hi Norman,

I'm running the goa Hello-example from the genodians page https://www.genodians.org/nfeske/2019-11-25-goa

However, I got this error at the goa run step:

$ goa run Error: runtime lacks a configuration

You may declare a 'config' attribute in the <runtime> node, or define a <config> node inside the <runtime> node.

I fixed it by adding a <config /> node in pkg/hello/runtime. ie:

<runtime ram="1M" caps="100" binary="hello"> <config /> ...

You might want to update the genodians page so it keeps working for others.

Cheers, Guido.