{
    "project_name": "my django project",
    "repo_name": "{{ cookiecutter.project_name|replace(' ', '_') }}",
    "author_name": "Your name",
    "email": "Your email",
    "windows": "n",
    "python_version": "python-3.4.3",
    "dokku_server": "mydokkuserver.com" 
}

{
    "project_name": "my django project",
    "repo_name": "{{ cookiecutter.project_name|replace(' ', '_') }}",
    "author_name": "Your name",
    "email": "Your email",
    "windows": "n",
    "python_version": "python-3.5.0",
    "dokku_server": "mydokkuserver.com" 
}

Change default python version to 3.5
Change default python version to 3.5
