Update deployschema.sh

Fix issue by which `deployschema.sh` wouldn't exit if it failed.

Author: dankhen

.ebextensions/deployschema.sh

@@ -1,7 +1,9 @@
 #!/bin/sh
+set -ex
+
 /usr/bin/mysql \
     -u $RDS_USERNAME \
     -p$RDS_PASSWORD \
     -h $RDS_HOSTNAME \
     $RDS_DB_NAME \
-    -e 'CREATE TABLE IF NOT EXISTS urler(id INT UNSIGNED NOT NULL AUTO_INCREMENT, author VARCHAR(63) NOT NULL, message TEXT, PRIMARY KEY (id))'
+    -e 'CREATE TABLE IF NOT EXISTS urler(id INT UNSIGNED NOT NULL AUTO_INCREMENT, author VARCHAR(63) NOT NULL, message TEXT, PRIMARY KEY (id))'