Fix missing config option in example#352

I used the example highlighted in the PR, and it didn't work. On looking at the docs more closely, it says: ``` When glob: True, Dotbot uses [glob.glob](https://docs.python.org/3/library/glob.html#glob.glob) to resolve glob paths, expanding Unix shell-style wildcards, which are not the same as regular expressions; Only the following are expanded: ``` I took this to mean that `glob: true` _must_ be used if you want glob patterns to be expanded. Once I did that, everything worked as it should have. So I think the example is just missing this option and thought I'd submit this PR to fix it.