DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': ':memory:',
    },
}

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'markdown_deux',
    'hermes',
)

SECRET_KEY = 'abcde12345'

USE_TZ = True

ROOT_URLCONF = 'hermes.urls'
MIDDLEWARE_CLASSES = ()

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'APP_DIRS': True,
        'DIRS': [
            # root('templates'),
        ],
        'OPTIONS': {
            'debug': True,
            'context_processors': [
                'django.contrib.auth.context_processors.auth',
                'django.template.context_processors.debug',
                'django.template.context_processors.i18n',
                'django.template.context_processors.media',
                'django.template.context_processors.static',
                'django.template.context_processors.tz',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    }
]

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': ':memory:',
    },
}

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'markdown_deux',
    'hermes',
)

SECRET_KEY = 'abcde12345'

USE_TZ = True

ROOT_URLCONF = 'hermes.urls'
MIDDLEWARE_CLASSES = ()

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'APP_DIRS': True,
        'DIRS': [
            # root('templates'),
        ],
        'OPTIONS': {
            'debug': True,
            'context_processors': [
                'django.contrib.auth.context_processors.auth',
                'django.template.context_processors.debug',
                'django.template.context_processors.i18n',
                'django.template.context_processors.media',
                'django.template.context_processors.static',
                'django.template.context_processors.tz',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    }
]

Change sqlite to postgres