message: Revise Mac bash commands to install arm-gcc-bin library.
diff: @@ -70,7 +70,8 @@ sudo pacman -S tup
  #### Mac
  First install [Homebrew](https://brew.sh/). Then you can run these commands in Terminal:
  ```bash
  -brew cask install gcc-arm-embedded
  +brew tap osx-cross/arm
  +brew install arm-gcc-bin
  brew cask install osxfuse && brew install tup
  brew install openocd
  ```
  