Fix extending list of posts for download

.gitignore

@@ -3,3 +3,5 @@
 .mypy_cache
 __pycache__
 *.db
+*.db-shm
+*.db-wal

archive.py

@@ -65,7 +65,7 @@ else:
             download_count -= 100
             download_offset += 100
         posts_raw_tmp = vk.wall.get(domain=args.group, offset=download_offset, count=to_download)
-        posts_raw["items"].append(*posts_raw_tmp["items"])
+        posts_raw["items"].extend(posts_raw_tmp["items"])
         last_post_count += len(posts_raw_tmp["items"])
 posts = posts_raw["items"]
 for p in posts: