Change the load method to startup

This lets the plugin start before the world is generated, this is done so you can SSH into the server while it's still technically starting.

src/main/resources/plugin.yml

@@ -2,7 +2,8 @@ name: SSHD
 version: ${project.version}
 author: Ryan Michela, Haarolean, toxuin, Justin Crawford
 main: com.ryanmichela.sshd.SshdPlugin
+load: STARTUP
 commands:
   mkpasswd:
     description: Make a SSHD password hash
-    usage: /mkpasswd <hash|help> <password>
+    usage: /mkpasswd <hash|help> <password>