Update composer.config to include required changes

Author: Abhishek Singh

.ebextensions/composer.config

@@ -3,6 +3,8 @@ commands:
     command: export COMPOSER_HOME=/root && /usr/bin/composer.phar self-update
 
 option_settings:
-  - namespace: aws:elasticbeanstalk:application:environment
-    option_name: COMPOSER_HOME
-    value: /root
+  aws:elasticbeanstalk:application:environment:
+    COMPOSER_HOME: /root
+  aws:elasticbeanstalk:container:php:phpini:
+    document_root: /web
+