Added missing (#1241)

Added missing link in config file

from - http://wiki.sk89q.com/wiki/CraftBook/Usage

to - https://craftbook.enginehub.org/en/3.x/mechanics/

src/main/resources/defaults/config.yml

@@ -2,7 +2,7 @@
 # This configuration will automatically add new configuration options for you,
 # So there is no need to regenerate this configuration unless you need to.
 # More information about these features are available at...
-# http://wiki.sk89q.com/wiki/CraftBook/Usage
+# https://craftbook.enginehub.org/en/3.x/mechanics/
 #
 # NOTE! NOTHING IS ENABLED BY DEFAULT! ENABLE FEATURES TO USE THEM!