Add comma to DESCRIPTION to build correctly

Author: arnold-c

DESCRIPTION

@@ -46,7 +46,7 @@ Authors@R: c(
   person('Jay', 'Hesselberth', role = c('aut', 'ctb'), email = 'jay.hesselberth@gmail.com', comment = c(ORCID = '0000-0002-6299-179X')),
   person("Alfredo", "Hernández", role = c("ctb"), email = "aldomann.designs@gmail.com", comment = c(ORCID = "0000-0002-2660-4545")),
   person("Stefano", "Coretta", role = c("ctb"), email = "stefano.coretta@gmail.com", comment = c(ORCID = "0000-0001-9627-5532", github = "stefanocoretta")),
-  person("Alvaro", "Uzaheta", role = c("ctb"), email = "alvaro.uzaheta@gess.ethz.ch", comment = c(github = "auzaheta"))
+  person("Alvaro", "Uzaheta", role = c("ctb"), email = "alvaro.uzaheta@gess.ethz.ch", comment = c(github = "auzaheta")),
   person("Callum", "Arnold", role = c("ctb"), email = "cal.rk.arnold@gmail.com", comment = c(github = "arnold-c"))
   )
 Description: A suite of custom R Markdown formats and templates for