Send URL instead of whole image

[dinhanhx]

Send URL instead of whole image

[Huy-Ngo]

The performance issue is likely caused by the slow API: Firstly, the API is written in Python, and secondly, it searched several subreddits to return one image. In addition, the message was not a link. It's an embedded message, and you even have to send more information, which theoretically just slow it down. See Message Embed | discord.js for implementation on Node.js.
The image was also sent via URL as well (see: discord.js doc).

However, I don't think we can conclude without experiment. Feel free to make a PR and if the time turns out to be faster, then I'll merge it.

[Huy-Ngo]

I don't know how Dank Memer bot choose which meme to send, but certainly the current algorithm I'm using contributes to this bot's slowness. It'd be great too, if you can come up with a better algorithm while still maintaining randomness.