buck brew formula uses depends_on syntax deprecated as of brew 1.5.0

[sslavic]

Warning: Calling 'depends_on :ant' is deprecated!
Use 'depends_on "ant"' instead.
/usr/local/Homebrew/Library/Taps/facebook/homebrew-fb/buck.rb:19:in `<class:Buck>'
Please report this to the facebook/fb tap!

For more info see:

• https://brew.sh/2018/01/19/homebrew-1.5.0/
• Add more deprecations, disable some existing ones. Homebrew/brew#3652

[ttsugriy]

Thanks for reporting @sslavic! I have pushed the fix and brew install buck is warning free.