Remove .onAttach citation info

Change-Id: I85cab17201cd297ca3a66a10be5bb7598b458f63
diff --git a/R/rderekovecs-package.R b/R/rderekovecs-package.R
index 213d96f..e6a755d 100644
--- a/R/rderekovecs-package.R
+++ b/R/rderekovecs-package.R
@@ -3,13 +3,5 @@
 
 ## usethis namespace: start
 #' @importFrom utils citation
-
-.onAttach<-function(libname, pkgname){
-  requireNamespace("utils")
-  cit<-citation(pkgname)
-  txt<-paste(c(format(cit,"citation")),collapse="\n\n")
-  packageStartupMessage(txt)
-}
-
 ## usethis namespace: end
 NULL