[Python] Generating a client, the packageUrl configuration parameter is ignored.

Description

Generating a Python client, the packageUrl configuration parameter is ignored. After changing it in the specified configuration file, the generated README.md file still directs users to the placeholder URL:

pip install git+https://github.com/GIT_USER_ID/GIT_REPO_ID.git

Swagger-codegen version

2.3.1

Swagger declaration file content or url

--> http://docs.automox.com/api/swagger.yaml

config.json:

{
	"packageName": "automox",
	"packageVersion": "0.1.1",
	"packageUrl": "https://github.com/PatchSimple/automox-python.git"
}

Command line used for generation

swagger-codegen generate -i swagger.yaml -l python -o . -c config.json

Steps to reproduce

Generate python client with above configuration.

Start with the Python client generation path and the README.md output produced by the command using config.json; compare how packageUrl is read with the value rendered in README.md. Done means the configured repository URL appears instead of the placeholder URL when the client is generated.