Use 'latest' any-db instead of '*'.

If gesundheit is updated to use features (or fixes) in new `any-db`
version, existing `gesundheit` users will not get the updated
any-db version since any version can satisfy '*' thus the module
will occasionally break in strange ways when you make updates
to either module.

Further, `npm update gesundheit` won't fix it because '*' is
already satisfied with the buggy version (same issue) leading
to confusion.

I assumed that 'latest' is what is meant by specifying '*'.
That is, gesundheit is tightly coupled to any-db so there is no
point in specifying exact versions and both should be updated
together.