Provides a simple command to check whether a website is up or down (using isup.me).

### Usage
```
<@GLolol> %check google.com
<@Atlas> It's just you. google.com is up.
<@GLolol> %check afgaeiogjoeajgaeogaegierg.net
<@Atlas> It's not just you. afgaeiogjoeajgaeogaegierg.net appears to be down.
```