Update _config.yml

Author: kyrretl

_config.yml

@@ -33,7 +33,7 @@ carpentry: "swc"
 # dc-image:         for Data Carpentry Image Processing
 # swc-inflammation: for Software Carpentry based on the inflammation data
 # swc-gapminder:    for Software Carpentry based on the Gapminder dataset
-curriculum: "sql"
+curriculum: "r"
 
 # If there is both an R and python official version of a curriculum
 # (as listed on https://software-carpentry.org/lessons/ and