Fine-tune author list

DESCRIPTION

@@ -8,7 +8,7 @@ Authors@R: c(person("Aditya",   "Bhagwat",    NULL, "aditya.bhagwat@mpi-bn.mpg.d
             person( "Jens",     "Preussner",  NULL, "jens.preussner@mpi-bn.mpg.de",     "ctb"),
             person( "Michael",  "Lawrence",   NULL, "lawrence.michael@gene.com",        "ctb"),
             person( "Hervé",    "Pagès",      NULL, "hpages.on.github@gmail.com",       "ctb"),
-            person( "Johannes", "Graumann",   NULL, 'johannes.graumann@uni-marburg.de', c("sad", "rth")),
+            person( "Johannes", "Graumann",   NULL, 'johannes.graumann@uni-marburg.de', "sad"),
             person( "Mario",    "Looso",      NULL, "mario.looso@mpi-bn.mpg.de",        c("sad","rth")))
 Description: This package is for designing Crispr/Cas9 and Prime Editing experiments.
              It contains functions to (1) define and transform genomic targets, (2) find spacers