Update README.md

Author: sofwar

README.md

@@ -105,6 +105,11 @@ file, the following options can be overridden:
 - `databaseConfig.redis.host`: `LARAVEL_ECHO_SERVER_REDIS_HOST`
 - `databaseConfig.redis.port`: `LARAVEL_ECHO_SERVER_REDIS_PORT`
 - `databaseConfig.redis.password`: `LARAVEL_ECHO_SERVER_REDIS_PASSWORD`
+- `protocol`: `LARAVEL_ECHO_SERVER_PROTO`
+- `sslKeyPath`: `LARAVEL_ECHO_SERVER_SSL_KEY`
+- `sslCertPath`: `LARAVEL_ECHO_SERVER_SSL_CERT`
+- `sslPassphrase`: `LARAVEL_ECHO_SERVER_SSL_PASS`
+- `sslCertChainPath`: `LARAVEL_ECHO_SERVER_SSL_CHAIN`
 
 
 ### Running with SSL