Improve prompts for questions during installation

bitegra/slides#1 Enhance volume.php to allow mounting of subdirectories

run/scripts/start

@@ -3,7 +3,7 @@
 function getConfig() {
   if [[ ! -n ${PHP_VERSION} ]]; then
     while true; do
-      read -p "Which PHP version is your project using? " PHP_VERSION
+      read -p "Which PHP version is your project using? [0=No, 1=Yes] " PHP_VERSION
       case ${PHP_VERSION} in
       7.0) break ;;
       7.1) break ;;
@@ -17,7 +17,7 @@ function getConfig() {
   fi
   if [[ ! -n ${COMPOSER_DOWNGRADE} ]]; then
     while true; do
-      read -p "Do you want to downgrade Composer to version 1? " COMPOSER_DOWNGRADE
+      read -p "Do you want to downgrade Composer to version 1? [0=No, 1=Yes] " COMPOSER_DOWNGRADE
       case ${COMPOSER_DOWNGRADE} in
       0) break ;;
       1) break ;;