add pretty colours to top20 CRAN downloads chart
add pretty colours to top20 CRAN downloads chart

today-is-a-good-day/quiri.github.io,yukiegosapporo/quiri.github.io,today-is-a-good-day/quiri.github.io,safferli/quiri.github.io,today-is-a-good-day/quiri.github.io,Quiri/quiri.github.io,safferli/quiri.github.io,today-is-a-good-day/quiri.github.io,yukiegosapporo/quiri.github.io,safferli/quiri.github.io,yukiegosapporo/quiri.github.io,safferli/quiri.github.io,yukiegosapporo/quiri.github.io,Quiri/quiri.github.io,safferli/quiri.github.io,Quiri/quiri.github.io,today-is-a-good-day/quiri.github.io,Quiri/quiri.github.io,Quiri/quiri.github.io