Update 2_playing.Rmd

download.file("http://vanatteveldt.com/wp-content/uploads/rcourse/data/income_topdecile.csv", 
              destfile="income_topdecile.csv")

Moet worden

download.file("http://vanatteveldt.com/wp-content/uploads/rcourse/income_topdecile.csv", 
              destfile="income_topdecile.csv")