gem-completion Package Installation on Mac

Bash completion for gem!
More Information: https://github.com/mernen/completion-ruby
Steps:

1. Launch Terminal by pressing command+space, type terminal and hit Enter key.
2. Run

   ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

3. Install

   brew install gem-completion

Done!