Merge pull request #7683 from pashields/help-command

Fix help command in example

Author: HugoMario

README.md

@@ -90,7 +90,7 @@ Right now there is a release candidate (rc0) version, which you can grab it dire
 ```sh
 wget http://central.maven.org/maven2/io/swagger/swagger-codegen-cli/3.0.0-rc0/swagger-codegen-cli-3.0.0-rc0.jar -O swagger-codegen-cli.jar
 
-java -jar swagger-codegen-cli.jar help
+java -jar swagger-codegen-cli.jar --help
 ```
 
 For Windows users, you will need to install [wget](http://gnuwin32.sourceforge.net/packages/wget.htm) or you can use Invoke-WebRequest in PowerShell (3.0+), e.g. `Invoke-WebRequest -OutFile swagger-codegen-cli.jar http://central.maven.org/maven2/io/swagger/swagger-codegen-cli/3.0.0-rc0/swagger-codegen-cli-3.0.0-rc0.jar`