Drop support for orphaned plotly package

Change-Id: I59e5339c613fc1eef89bb81afc0c260e2f60ed16
diff --git a/demo/conditionsOverTime.R b/demo/conditionsOverTime.R
index b23d2bf..ccd5592 100644
--- a/demo/conditionsOverTime.R
+++ b/demo/conditionsOverTime.R
@@ -6,7 +6,6 @@
 #install_git("https://korap.ids-mannheim.de/gerrit/KorAP/RKorAPClient", upgrade="never")
 library(RKorAPClient)
 library(ggplot2)
-library(plotly)
 
 conditionsOverTime <- function(query, conditions, years, kco = new("KorAPConnection", verbose = TRUE)) {
   g <- expand_grid(condition = conditions, year = years) %>%
@@ -17,8 +16,7 @@
     xlab("TIME") +
     labs(color="Virtual Corpus", fill="Virtual Corpus") +
     ylab(sprintf("Observed frequency/million of \u201c%s\u201d", query))
-  p <- RKorAPClient::ggplotly(g)
-  print(p)
+  print(g)
 }
 
 conditionsOverTime("[tt/l=Heuschrecke]", c("textClass = /natur.*/", "textClass=/politik.*/", "textClass=/wirtschaft.*/"), (2002:2018))