improve R Core ctb entry

DESCRIPTION

@@ -6,7 +6,7 @@ Authors@R: c(person(given = "John", family = "Fox", role = "aut", email = "jfox@
              person(given = "Christian", family = "Kleiber", role = "aut", email = "[email protected]", comment = c(ORCID = "0000-0002-6781-4733")),
              person(given = "Achim", family = "Zeileis", role = c("aut", "cre"), email = "[email protected]", comment = c(ORCID = "0000-0003-0918-3766")),
              person(given = "Nikolas", family = "Kuschnig", role = "ctb", email = "[email protected]", comment = c(ORCID = "0000-0002-6642-2543")),
-             person("R-Core", role="ctb"))
+             person(given = "R Core Team", role = "ctb", email = "[email protected]"))
 Description: Instrumental variable estimation for linear models by two-stage least-squares (2SLS) regression or by robust-regression via M-estimation (2SM) or MM-estimation (2SMM). The main ivreg() model-fitting function is designed to provide a workflow as similar as possible to standard lm() regression. A wide range of methods is provided for fitted ivreg model objects, including extensive functionality for computing and graphing regression diagnostics in addition to other standard model tools.
 License: GPL (>= 2)
 Depends: R (>= 3.6.0)