Log Message:
swirc: update to 3.4.0.

## [3.4.0] - 2023-02-10 ##
- **Added** a SOCKS proxy client
- **Added** command `/fetchdic`
- **Added** destruction of null bytes on receive where appropriate
- **Added** spelling support with Hunspell
- **Added** the following config options:
  - `socks` (bool)
  - `socks_atyp` (int)
  - `socks_host` (string)
  - `socks_port` (string)
  - `spell` (bool)
  - `spell_lang` (string)
  - `spell_syswide` (bool)
- **Added** usage of `emplace_back()`
- **Fixed** possible crashes