Fix mistake in kindOf.ts

In function miniKindOf: in other case, forget to invoke 'Object.prototype.toString' to get type

src/utils/kindOf.ts

@@ -30,7 +30,7 @@ export function miniKindOf(val: any): string {
   }
 
   // other
-  return type.slice(8, -1).toLowerCase().replace(/\s/g, '')
+  return Object.prototype.toString.call(val).slice(8, -1).toLowerCase().replace(/\s/g, '')
 }
 
 function ctorName(val: any): string | null {