Posts don't soft-wrap at window edge

[couladin]

I believe this is a different issue to #16 (I think that's to do with being able to do something like use Ctrl+Enter to insert newlines to expand a post composition across multiple lines?).

It appears that mastodon.nvim does not soft-wrap long lines to fit within the window in which it's active, causing information to disappear off the edge.

Example using a real post (reference, in case it's useful):

• In mastodon.nvim, lines 4-5 exceed the window width (not as much of an issue for the URL, but line 5 is a problem):
  

• In the web client, the long lines soft-wrap:
  

I understand this can be done globally with [no]wrap/vim.opt.wrap, but it would be great if this could be automatic or configurable for mastodon.nvim.