Merge pull request #1 from hyrodium/patch-1

Show YouTube thumbnail in README.md

Author: bkamins

README.md

@@ -1,10 +1,10 @@
 # JuliaCon2021 DataFrames.jl Tutorial
 
+[![JuliaCon2021 Talk](https://img.youtube.com/vi/tJf24gfcSto/0.jpg)](https://www.youtube.com/watch?v=tJf24gfcSto)
+
 This is a tutorial on [DataFrames.jl](https://github.com/JuliaData/DataFrames.jl)
 prepared for [JuliaCon2021](https://juliacon.org/2021/).
 
-A video recording of the tutorial is available [here](https://www.youtube.com/watch?v=tJf24gfcSto).
-
 In order to run the tutorial make sure that you have Julia executable installed.
 The tutorial was updated to Julia 1.9.0 and DataFrames.jl 1.5.0.