fixup! Add 'caption' to file message

Add CLI file caption support

tests/test_cli.py

@@ -167,6 +167,7 @@ async def test_send_file(self, cli, server):
         output_1 = await cli(
             'send-file', 'ECHOECHO', pytest.msgapi['msgapi']['id'],
             pytest.msgapi['msgapi']['secret'], pytest.msgapi['msgapi']['private'],
+            'See the picture?',
             server.threema_jpg)
         assert output_1
         assert len(server.latest_blob_ids) == 1

threema/gateway/bin/gateway_client.py

@@ -421,6 +421,7 @@ async def send_video(ctx, **arguments):
 @click.argument('secret')
 @click.argument('private_key')
 @click.argument('file_path')
+@click.argument('caption', required=False)
 @click.option('-k', '--public-key', help="""
 The public key of the recipient. Will be fetched automatically if not provided.
 """)
@@ -452,7 +453,8 @@ async def send_file(ctx, **arguments):
             to_id=arguments['to'],
             key=public_key,
             file_path=arguments['file_path'],
-            thumbnail_path=arguments['thumbnail_path']
+            thumbnail_path=arguments['thumbnail_path'],
+            caption=arguments['caption']
         )
 
         # Send message