Update installer.sh

installer.sh

@@ -56,15 +56,15 @@ echo "Installing Crib (Ruby $RUBY_VERSION)"
 echo "Install locally ~/.local/bin or globally /usr/bin? [l/g]"
 read -r choice
 case "$choice" in
-l | L)
+(l | L)
   INSTALL_DIR="$HOME/.local/bin"
   SUDO=""
   ;;
-g | G)
+(g | G)
   INSTALL_DIR="/usr/bin"
   SUDO="sudo"
   ;;
-*)
+(*)
   echo "Invalid choice"
   exit 1
   ;;