Don't pass pointers to set.Strings reference values

set.Strings is already a map type, a reference value if you like, so there is no need to pass its address, you're already passing a pointer to it.
Merge pull request #262 from davecheney/129-set-strings-is-already-a-reference-type

Don't pass pointers to set.Strings reference values

set.Strings is already a map type, a reference value if you like, so there is no need to take its address, you're already passing a pointer to it.