MINOR: server: add new parameters

Add on-marked-down, on-error, on-marked-up to the server options.

Author: yuzhichang

README.md

@@ -6,10 +6,11 @@ This project contains structs and validation methods that are autogenerated usin
 
 ## Contributing
 
-You can generate the models using the following command:
+You can generate the models using the following command in build directory:
 
 ```
-./swagger generate model -f haproxy_spec.yaml \
+swagger generate model -f haproxy_spec.yaml \
+    -r ../copyright.txt \
     -m models \
     -t $GOPATH/src/github.com/haproxytech/
 ```