Added config version "control"

src/main/java/wtf/hak/survivalfabric/config/Config.java

@@ -2,6 +2,8 @@ package wtf.hak.survivalfabric.config;
 
 public class Config {
 
+    public String configVersion = "1.0";
+
     public boolean joinMessageEnabled = true;
     public String joinMessage = "§8[§a+§8] §7%s";
 

src/main/java/wtf/hak/survivalfabric/config/ConfigManager.java

@@ -26,9 +26,15 @@ public class ConfigManager {
     public static Config load() {
         try(FileReader reader = new FileReader(CONFIG_FILE)) {
             INSTANCE = GSON.fromJson(reader, Config.class);
+            if (INSTANCE.configVersion.equalsIgnoreCase(new Config().configVersion)) {
+                return INSTANCE;
+            }
+            INSTANCE.configVersion = new Config().configVersion;
+            save(INSTANCE);
             return INSTANCE;
         } catch (IOException e) {
             Config config = new Config();
+            INSTANCE = config;
             save(config);
             return config;
         }
@@ -41,4 +47,4 @@ public class ConfigManager {
             System.out.println("Error saving config: " + e.getMessage());
         }
     }
-}
+}