♻️💄 simplify KorAPConnection class instantiations to modern syntax

Update all class instantiations from `new("KorAPConnection")` to `KorAPConnection()`.
This is possible with R >= 4.0.

Change-Id: I01131fb32045e084cafbb9e05cd8ba99f8f20f1b
diff --git a/demo/regional.R b/demo/regional.R
index e0c3df8..81ddae1 100755
--- a/demo/regional.R
+++ b/demo/regional.R
@@ -39,7 +39,7 @@
 
 map <- fetchMaps(c("DEU_1", "AUT_0", "CHE_0", "LUX_0", "BEL_3", "ITA_1", "LIE_0"), c(0, 0, 0, 0, 34, 17, 0))
 
-geoDistrib <- function(query, kco = new("KorAPConnection", verbose=TRUE)) {
+geoDistrib <- function(query, kco = KorAPConnection(verbose=TRUE)) {
   regions <- readRDS("demo/data/regions.rds")
   regions$freq <- NA
   regions$url <- NA