protected files in example

Update README to reflect protected files in the example

Author: kuthiala

README.md

@@ -42,6 +42,7 @@ jobs:
         nginx-config-directory-path: config/
         nginx-root-config-file: nginx.conf
         transformed-nginx-config-directory-path: /etc/nginx/
+        protected-files: 'nginx/servers/server1.conf,nginx/servers/server2.conf'
         debug: false
 ```
 
@@ -85,6 +86,7 @@ jobs:
         nginx-config-directory-path: config/
         nginx-root-config-file: nginx.conf
         transformed-nginx-config-directory-path: /etc/nginx/
+        protected-files: 'nginx/servers/server1.conf,nginx/servers/server2.conf'
         debug: false
 ```