Update mxnet install script for OSX. homebrew/science to homebrew/core (

apache#9924)

docs/install/osx_setup.md

@@ -47,7 +47,7 @@ Now we can start to build MXNet.
 ### Install MXNet dependencies
 Install the dependencies, required for MXNet, with the following commands:
 - [Homebrew](http://brew.sh/)
-- OpenBLAS and homebrew/science (for linear algebraic operations)
+- OpenBLAS and homebrew/core (for linear algebraic operations)
 - OpenCV (for computer vision operations)
 
 ```bash
@@ -63,7 +63,7 @@ Install the dependencies, required for MXNet, with the following commands:
 	brew install pkg-config
 	brew install graphviz
 	brew install openblas
-	brew tap homebrew/science
+	brew tap homebrew/core
 	brew install opencv
 	# For getting pip
 	brew install python

setup-utils/install-mxnet-osx-python.sh

@@ -50,7 +50,7 @@ export PATH="$PATH:/usr/bin:/opt/local/bin"        # for macports
 
 export MACPORTS_WEB="https://guide.macports.org/chunked/installing.macports.html"
 
-export BREW_PKGS="pkg-config python   opencv graphviz homebrew/science/openblas"
+export BREW_PKGS="pkg-config python   opencv graphviz homebrew/core/openblas"
 export PORT_PKGS="pkgconfig  python36 opencv graphviz openblas-devel"
 
 # graphviz, opencv-python skipped since already installed via brew/port
@@ -193,7 +193,7 @@ install_brew() {
 
 	echo "BEGIN: Install dependent brew packages for MXNet: ${BREW_PKGS}"
 
-	chkret brew tap homebrew/science
+	chkret brew tap homebrew/core
 
 	# install each individually to see progress for each
 	for pkg in ${BREW_PKGS}