InputStreams for attachments are not closed

[Moire9]

When you add attachments with a MessageCreateBuilder, you give it an InputStream that it reads the data from. However, this stream is never closed, which is very bad.

Fix: in dev.kord.rest.request.Request, replace line 86 with files[0].second.use { it.copyTo(outputStream()) }, and replace lines 88-90 with append("file$index", pair.first) { pair.second.use { it.copyTo(outputStream()) } }

Should look like this:

Excuse the lack of input highlighting, IntelliJ was having issues.