fix typo and default value of animated (#417)

* fix typo and default value of animated

* fix test

Author: clsung

linebot/models/flex_message.py

@@ -501,7 +501,7 @@ def __init__(self,
                  aspect_mode=None,
                  background_color=None,
                  action=None,
-                 animated=None,
+                 animated=False,
                  **kwargs):
         """__init__ method.
 
@@ -524,7 +524,7 @@ def __init__(self,
         :param str background_color: Background color of the image. Use a hexadecimal color code.
         :param action: Action performed when this image is tapped
         :type action: list[T <= :py:class:`linebot.models.actions.Action`]
-        :param bool action: True to play an animated image
+        :param bool animated: True to play an animated image. Default is False.
         :param kwargs:
         """
         super(ImageComponent, self).__init__(**kwargs)

tests/models/test_flex_message.py

@@ -218,6 +218,7 @@ def test_image_component(self):
         arg = {
             'url': 'https://example.com/flex/images/image.jpg',
             'size': 'full',
+            'animated': False,
             'aspect_ratio': '1.91:1'
         }
         self.assertEqual(
@@ -260,6 +261,7 @@ def test_video_component(self):
                 "size": "full",
                 "aspect_ratio": "20:13",
                 "aspect_mode": "cover",
+                "animated": False,
                 "url": "https://example.com/image.jpg"
             },
             "aspect_ratio": "20:13"