add response validation to readme

README.md

@@ -25,6 +25,8 @@ Install the openapi validator
 ```javascript
 new OpenApiValidator({
   apiSpec: './test/resources/openapi.yaml',
+  validateRequests: true, // (default)
+  validateResponses: true, // false by default
 }).install(app);
 ```
 
@@ -67,6 +69,16 @@ new OpenApiValidator(options).install(app);
 
 **`apiSpec:`** a string value specifying the path to the OpenAPI 3.0.x spec or a JSON object representing an OpenAPI spec.
 
+**`validateRequests:`** enable response validation.
+
+- true - (default) validate requests
+- false - do not validate requests
+
+**`validateResponses:`** enable response validation.
+
+- true - validate responses
+- false - (default) do not validate responses
+
 **`coerceTypes:`** change data type of data to match type keyword. See the example in Coercing data types and coercion rules. Option values:
 
 - true - (default) coerce scalar data types.
@@ -75,7 +87,6 @@ new OpenApiValidator(options).install(app);
 
 **`multerOpts:`** the [multer opts](https://github.com/expressjs/multer) to passthrough to multer
 
-
 ## Example Express API Server
 
 Try the complete example below: