Fixed INSTALL.txt incorrectly referring to the plugin name.

INSTALL.txt

@@ -6,7 +6,7 @@ This plugin requires Hey0's server modification.
 (1) Create a "plugins" folder inside your "bin" folder.
 (2) Copy SMWorldEdit.jar and jnbt.jar into plugins/.
 (3) Add "SMWorldEdit" to "plugins" in your server.properties file, like so:
-    plugins=WorldEdit
+    plugins=SMWorldEdit
     If you have multiple plugins, separate plugin names with commas:
     plugins=AnotherPlugin,SMWorldEdit