Update README.md

Signed-off-by: LOSAPIO Jean-Christophe <jeanchristophe.losapio@orange.com>

Author: JCL38-ORANGE

README.md

@@ -3,5 +3,6 @@
 it is a bundled k6 extensions image including : 
 - https://github.com/GhMartingit/xk6-mongo extension
 - https://github.com/grafana/xk6-sql-driver-postgres
+- https://github.com/grafana/xk6-sql-driver-mysql
 - https://github.com/grafana/xk6-sql
 - https://github.com/grafana/xk6-loki