Make Heuschrecken-Example less time-consuming

Change-Id: I12fbab9a177b7e97ed9524a2a7b62a82697b3aef
diff --git a/R/misc.R b/R/misc.R
index 19ee92c..feafbf5 100644
--- a/R/misc.R
+++ b/R/misc.R
@@ -97,7 +97,7 @@
 #' library(ggplot2)
 #' kco <- new("KorAPConnection", verbose=TRUE)
 #' expand_grid(condition = c("textDomain = /Wirtschaft.*/", "textDomain != /Wirtschaft.*/"),
-#'             year = (2002:2018)) %>%
+#'             year = (2005:2011)) %>%
 #'   cbind(frequencyQuery(kco, "[tt/l=Heuschrecke]",
 #'                             paste0(.$condition," & pubDate in ", .$year)))  %>%
 #'   ipm() %>%