fix(instance): save cliConfig if running is found to be false

no issue
- actually save the config, don't just set the value

lib/instance.js

@@ -37,7 +37,7 @@ class Instance {
         this.loadProcess();
 
         if (!this.process.isRunning(this.dir)) {
-            this.cliConfig.set('running', null);
+            this.cliConfig.set('running', null).save();
             return false;
         }