Update link formatting in readme

Author: thomasp85

README.Rmd

@@ -73,7 +73,7 @@ If you are new to ggplot2 you are better off starting with a systematic introduc
     possible.
 
 1.  If you'd like to follow a webinar, try
-    [Plotting Anything with ggplot2][https://youtu.be/h29g21z0a68] by Thomas Lin 
+    [Plotting Anything with ggplot2](https://youtu.be/h29g21z0a68) by Thomas Lin 
     Pedersen.
 
 1.  If you want to dive into making common graphics as quickly 

README.md

@@ -84,8 +84,8 @@ documentation pages. Currently, there are three good places to start:
     get you up to speed with the essentials of ggplot2 as quickly as
     possible.
 
-2.  If you’d like to follow a webinar, try \[Plotting Anything with
-    ggplot2\]\[<https://youtu.be/h29g21z0a68>\] by Thomas Lin Pedersen.
+2.  If you’d like to follow a webinar, try [Plotting Anything with
+    ggplot2](https://youtu.be/h29g21z0a68) by Thomas Lin Pedersen.
 
 3.  If you want to dive into making common graphics as quickly as
     possible, I recommend [The R Graphics