TypeError : 'QueryDict' object is not callable on markdown preview

When I try to preview my markdown I got an error 500 with this response.

`Environment:

Request Method: GET
Request URL: http://localhost:8000/markdown/preview/

Django Version: 1.8.4
Python Version: 3.4.3
Installed Applications:
('django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'blog',
'django_markdown')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.middleware.security.SecurityMiddleware')

Traceback:
File "/usr/lib/python3.4/site-packages/django/core/handlers/base.py" in get_response
1. response = wrapped_callback(request, _callback_args, *_callback_kwargs)
File "/usr/lib/python3.4/site-packages/django_markdown/views.py" in preview
2. content=request.REQUEST.get('data','No posted content'),

Exception Type: TypeError at /markdown/preview/
Exception Value: 'QueryDict' object is not callable`
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Start in django_markdown/views.py at the preview view and inspect the request access shown in the traceback. Reproduce the GET request to /markdown/preview/ with the reported Django and Python versions; done means the endpoint no longer raises the QueryDict TypeError and returns the markdown preview.

Written by the indexing model from the issue text.