♻️💄 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/recursiveCA.R b/demo/recursiveCA.R
index ce2be8b..720b00c 100644
--- a/demo/recursiveCA.R
+++ b/demo/recursiveCA.R
@@ -6,7 +6,7 @@
 nodeWordform <- 'aufmerksam'
 mdFile <- tempfile(nodeWordform, fileext = ".md")
 
-new("KorAPConnection", verbose = TRUE) %>%
+KorAPConnection(verbose = TRUE) %>%
   collocationAnalysis(
     nodeWordform,
     leftContextSize = 2,