Sum exercise markdown

[josephh]

Hi, not sure if this project is still being maintained...

Since seneca getting-started is 'no longer proven to work' thought I'd work through the examples in this project.

On the first exercise - Sum - there are examples of how to format an action pattern - as an object or as a string. But the examples are the same.

Does /problems/sum/problem.md need an amendment along the lines of

you can also specify patterns as String like this:

-seneca.add( {role:'greetings', cmd:'hello'}, ...);
+seneca.add('role:greetings, cmd:hello', ...);

[marcopiraccini]

Yes, it's maintained :)

[josephh]

Oh, great - I'll work through and let you know if I spot anything...
I could raise a PR for this if you like?

[piccoloaiutante]

@josephh that is always a good idea :)