IDs should be i64s, not ints.

[km19809]

According to doc, IDs and file sizes are at most 52 bits.

This number may have more than 32 significant bits and some programming languages may have difficulty/silent defects in interpreting it. But it has at most 52 significant bits, so a signed 64-bit integer or double-precision float type are safe for storing this identifier.

So they should be i64, not an int(32 bits integer).

The full list:

1. User.id
2. Chat.id
3. Message.migrate_to_chat_id
4. Message.migrate_from_chat_id
5. Animation.file_size
6. Audio.file_size
7. Document.file_size
8. Video.file_size
9. Voice.file_size
10. Contact.user_id
11. UserShared.user_id
12. ChatShared.user_id
13. File.file_size
14. ChatJoinRequest.user_chat_id
15. ResponseParameters.migrate_to_chat_id

Should I make a PR for this?