♻️💄 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/man/auth-KorAPConnection-method.Rd b/man/auth-KorAPConnection-method.Rd
index cf06c01..bdb0993 100644
--- a/man/auth-KorAPConnection-method.Rd
+++ b/man/auth-KorAPConnection-method.Rd
@@ -31,7 +31,7 @@
 }
 \examples{
 \dontrun{
-kco <- new("KorAPConnection", verbose = TRUE) \%>\% auth()
+kco <- KorAPConnection(verbose = TRUE) \%>\% auth()
 df <- collocationAnalysis(kco, "focus([marmot/p=ADJA] {Ameisenplage})",
   leftContextSize=1, rightContextSize=0)
 }