bootstrap.sh: use "grep -E" instead of "egrep", suggested by shellcheck

diff --git a/libexec/bootstrap.sh b/libexec/bootstrap.sh
index 1dee4f2..63318a4 100755 (executable)
--- a/libexec/bootstrap.sh
+++ b/libexec/bootstrap.sh
@@ -95,7 +95,7 @@ DRUPAL_CONSOLE="${PWD}/vendor/bin/drupal"
 # This becomes unnecessary if the installation profile gets pulled in by
 # composer.json, like suggested in
 # https://github.com/drupal-composer/drupal-project/issues/249
-if ! echo "$INSTALLATION_PROFILE" | egrep -q "^(minimal|standard)$";
+if ! echo "$INSTALLATION_PROFILE" | grep -q -E "^(minimal|standard)$";
 then
   if [ -d "${SITE_LOCAL_PATH}/profiles/${INSTALLATION_PROFILE}" -a "$OVERWRITE_PROFILE" != "true" ];
   then