[documentation] update INSTALL.md doc (cask is no longer a brew command)

Summary: cask is no longer a brew command: Homebrew/discussions#902

Reviewed By: ngorogiannis

Differential Revision: D30767937

fbshipit-source-id: 8f3b8c103

INSTALL.md

@@ -32,8 +32,7 @@ You can install some of these dependencies using
 [Homebrew](http://brew.sh/):
 
 ```sh
-brew install autoconf automake cmake opam pkg-config sqlite gmp mpfr
-brew cask install java
+brew install autoconf automake cmake opam pkg-config sqlite gmp mpfr java
 ```