Resolve SC2162: 'read without -r mangles backslashes'

More information:

https://github.com/koalaman/shellcheck/wiki/SC2162

http://wiki.bash-hackers.org/commands/builtin/read

plugins/apps/commands

@@ -31,7 +31,7 @@ case "$1" in
       dokku_log_warn "To proceed, type \"$APP\""
       echo ""
 
-      read -p "> " app_name
+      read -rp "> " app_name
       if [[ "$app_name" != "$APP" ]]; then
         dokku_log_fail "Confirmation did not match $APP. Aborted."
       fi