fix issue with isDirty

Author: bluebill1049

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hookform/devtools",
-  "version": "1.2.1",
+  "version": "2.0.0-beta.2",
   "description": "React Hook Form dev tool to help debugging forms",
   "main": "index.js",
   "types": "dist/index.d.ts",

src/panel.tsx

@@ -114,7 +114,7 @@ export default ({
             const type = get(value, 'ref.type', undefined);
             const isTouched = !!get(formState.touched, name);
             const isNative = (value as any).ref.type;
-            const isDirty = get(formState.dirtyFields, name);
+            const isDirty = !!Object.keys(formState.dirtyFields).length;
             const hasError = !!error;
             const ref = get(value, 'ref');