shiny-demo: Search until 2020

Change-Id: Ib1d9f12cf0cdd108384ef3bc1881102d2694f7a4
diff --git a/demo/shiny-apps/frequency_curves/server.R b/demo/shiny-apps/frequency_curves/server.R
index d1a913d..26406d9 100644
--- a/demo/shiny-apps/frequency_curves/server.R
+++ b/demo/shiny-apps/frequency_curves/server.R
@@ -1,6 +1,6 @@
 rsr <- new("KorAPConnection", verbose = TRUE)
 vc <- "referTo ratskorpus & pubDate in"
-years <- c(1995:2019)
+years <- c(1995:2020)
 query <- "Aluhut"
 logfile <- file("frequency_curves.log", open = "a")