Update maintainer to Gregory Jefferis <jefferis@gmail.com>

Author: jdmanton

DESCRIPTION

@@ -5,9 +5,9 @@ Title: NeuroAnatomy Toolbox ('nat') Extension for Assessing Neuron Similarity
 Version: 1.6.7
 Authors@R: c(
     person("Gregory", "Jefferis", email= "jefferis@gmail.com",
-      role = c("aut"), comment = c(ORCID = "0000-0002-0587-9355")),
+      role = c("aut", "cre"), comment = c(ORCID = "0000-0002-0587-9355")),
     person("James", "Manton", email="ajd.manton@googlemail.com",
-      role = c("aut", "cre"), comment = c(ORCID = "0000-0001-9260-3156"))
+      role = c("aut"), comment = c(ORCID = "0000-0001-9260-3156"))
     )
 Description: Extends package 'nat' (NeuroAnatomy Toolbox) by providing a
     collection of NBLAST-related functions for neuronal morphology comparison (Costa et al. (2016) <doi: 10.1016/j.neuron.2016.06.012>).