improve(meta): add opt-out for checking for newer version

Author: fauu

config/config.spec.hocon

@@ -153,3 +153,7 @@ ui: {
     height: "int | 60"
   }
 }
+
+update: {
+  check: "boolean | true"
+}

src/main/java/io/github/kamitejp/Kamite.java

@@ -323,7 +323,9 @@ public void run(Map<String,String> args, BuildInfo buildInfo) {
       );
     }
 
-    Executor.get().execute(() -> notifyIfNewerVersionAvailable(buildInfo));
+    if (config.update().check()) {
+      Executor.get().execute(() -> notifyIfNewerVersionAvailable(buildInfo));
+    }
 
     Runtime.getRuntime().addShutdownHook(new Thread(this::destroy));
   }