♻️💄 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/Rmd/ca.Rmd b/demo/Rmd/ca.Rmd
index a4016a5..eb9ad8c 100644
--- a/demo/Rmd/ca.Rmd
+++ b/demo/Rmd/ca.Rmd
@@ -13,7 +13,7 @@
 library(kableExtra)
 library(DT)
 library(tidyverse)
-kco <- new("KorAPConnection", verbose=T)
+kco <- KorAPConnection(verbose=T)
 if (!exists('ca')) {
 ca <- kco %>%
   collocationAnalysis(