<commit_before>Hello, I'm *Bumblebee*.

I support following commands:
 - *Image search*. Usage: /g, /p, /i <search criteria>
 - *Random image search*. Usage: /r /gr, /pr, /ir <search criteria>
 - *Youtube search*. Usage: /v, /y, <search criteria>
 - *Exchange rates* (to BYR): /rate <currency>
   Examples:
     /rate usd
     /rate eur
     /rate rub
   Aliases: /usd = /rate usd, /eur = /rate usd
 - *Exchange rate charts* (to BYR): /chart <currencies> <from> <to>
   Examples:
     /chart - show bar chart for current month for USD and EUR
     /chart usd eur rub - customize currencies
     /chart rub 30.08.2015 31.12.2015 - custom range
     /chart 30.08.2015 - custom range (up to current date)
     /chart 2013 2015 - custom range by years
     /chart 2007 - show whole year
 - "BYR Hunger Games" [incubating feature]
   /bid +30 - place bid
   /bids - show current bids
   ...
 - *Health check*. Usage: /status
 - *Help* (show this message). Usage: /start, /help
<commit_msg>Add /brent command (meduza.io stocks).<commit_after>Hello, I'm *Bumblebee*.

I support following commands:
 - *Image search*. Usage: /g, /p, /i <search criteria>
 - *Random image search*. Usage: /r /gr, /pr, /ir <search criteria>
 - *Youtube search*. Usage: /v, /y, <search criteria>
 - *Exchange rates* (to BYR): /rate <currency>
   Examples:
     /rate usd
     /rate eur
     /rate rub
   Aliases: /usd = /rate usd, /eur = /rate usd
 - *Exchange rate charts* (to BYR): /chart <currencies> <from> <to>
   Examples:
     /chart - show bar chart for current month for USD and EUR
     /chart usd eur rub - customize currencies
     /chart rub 30.08.2015 31.12.2015 - custom range
     /chart 30.08.2015 - custom range (up to current date)
     /chart 2013 2015 - custom range by years
     /chart 2007 - show whole year
 - "BYR Hunger Games" [incubating feature]
   /bid +30 - place bid
   /bids - show current bids
   ...
 - *Brent* - cost of oil. Usage: /brent
 - *Health check*. Usage: /status
 - *Help* (show this message). Usage: /start, /help

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