fix(Utils): read strings as character in the table with model features loaded by .FeatModels

- to be OK with R < 4.0.0
Refs #106

R/Utils.R

@@ -20,7 +20,7 @@
 ## table of feature models
 .FeatModels <- function() {
   path <- system.file("modelsFeatures/FeatModelsGR.csv", package = "airGR")
-  read.table(path, header = TRUE, sep = ";")
+  read.table(path, header = TRUE, sep = ";", stringsAsFactors = FALSE)
 }