Updated docs for correct usage of SWAGGER_JSON

README.md

@@ -46,7 +46,7 @@ Will start nginx with swagger-ui on port 80.
 Or you can provide your own swagger.json on your host
 
 ```
-docker run -p 80:8080 -e "SWAGGER_JSON=/foo/swagger.json" -v /bar:/foo swaggerapi/swagger-ui
+docker run -p 80:8080 -e SWAGGER_JSON=/foo/swagger.json -v /bar:/foo swaggerapi/swagger-ui
 ```
 
 ##### Prerequisites