update msgpack

prepare for v3

fix if structure contains slice inside, but the items in the internal…

… slice are not in the same order give wrong result (#82)

fix example test and check if identifier call is for struct

fix: slice index patch (#79)

fix: update to nil pointer (#78)

fix: add map with pointer value support (#76)

fix patching nil values

fix pointers when convert types is enabled

fix patch assignment to pointer values