Update mysql to latest patch

solidnerd · solidnerd · commit 0635c51b24c9 · 2018-03-31T09:50:03.000+02:00
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -1,8 +1,7 @@
 version: '2'
 services:
-
   mysql:
-    image: mysql:5.7.20
+    image: mysql:5.7.21
     environment:
     - MYSQL_ROOT_PASSWORD=secret
     - MYSQL_DATABASE=bookstack
