i believe it must be method call here :)

tested in my app like this:
```
    /** @test */
    public function get_all()
    {
        // given
        $user = $this->user;

        // action
        $user->addMeta('key', 'value');
        $user->addMeta('other', 'another_value');

        // assert
        $user = $user->fresh();
        $this->assertEquals(
            ['key' => 'value', 'other' => 'another_value'],
            $user->getAllMeta()->toArray()
        );
    }
```

src/Phoenix/EloquentMeta/MetaTrait.php

@@ -12,7 +12,7 @@ trait MetaTrait
      */
     public function getAllMeta()
     {
-        return new Collection($this->meta->pluck('value', 'key'));
+        return new Collection($this->meta()->pluck('value', 'key'));
     }
 
     /**