Bot will crash when user hosts channel

[taskinoz]

When someone hosts a channel the bot has joined, it will crash and spit out the following error

C:\Users\Tristan\Desktop\test-bot\node_modules\twitch-bot\lib\parser.js:33
    parsed.username = username.split('!')[0]
                               ^

TypeError: Cannot read property 'split' of undefined
    at Object.formatPRIVMSG (C:\Users\Tristan\Desktop\test-bot\node_modules\twitch-bot\lib\parser.js:33:32)
    at TLSSocket.irc.on.data (C:\Users\Tristan\Desktop\test-bot\node_modules\twitch-bot\lib\bot.js:76:32)
    at TLSSocket.emit (events.js:198:13)
    at addChunk (_stream_readable.js:288:12)
    at readableAddChunk (_stream_readable.js:265:13)
    at TLSSocket.Readable.push (_stream_readable.js:224:10)
    at TLSWrap.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)

[taskinoz]

It seems like this error has cropped up before #34 and has to do with the parser object containing nothing when someone hosts the channel