Increase dependabot to monthly updates.

There are not many critical changes nowadays.

.github/dependabot.yml

@@ -10,10 +10,10 @@ updates:
       interval: "monthly"
 
   # Maven project
-  - package-ecosystem: maven
+  - package-ecosystem: "maven"
     directory: "/"
     schedule:
-      interval: weekly
+      interval: "monthly"
 
     groups:
       production-dependencies:

README.md

@@ -69,7 +69,7 @@ Possible values: `Premium`, `Cracked`, `Unknown`
     * Protocol plugin:
       * [ProtocolLib 5.2+](https://www.spigotmc.org/resources/protocollib.1997/) or
       * [ProtocolSupport](https://www.spigotmc.org/resources/protocolsupport.7201/)
-  * Latest BungeeCord (or a fork e.g. Waterfall) or Velocity
+  * Latest BungeeCord (or a fork e.g. Waterfall) or Velocity proxy
 * An auth plugin.
 
 ### Supported auth plugins