Update repositorys/Remove dead repos

pom.xml

@@ -84,17 +84,9 @@
         </dependency>
     </dependencies>
     <repositories>
-        <repository>
-            <id>repobo-snap</id>
-            <url>http://repo.bukkit.org/content/groups/public</url>
-        </repository>
         <repository>
             <id>sk89q-repo</id>
-            <url>http://maven.sk89q.com/repo/</url>
-        </repository>
-        <repository>
-            <id>kitteh-repo</id>
-            <url>http://repo.kitteh.org/content/groups/public</url>
+            <url>https://maven.sk89q.com/repo/</url>
         </repository>
         <repository>
             <id>spigot-repo</id>