Update forms.py

I am using Django 1.6. I am getting the following.
DeprecationWarning: Creating a ModelForm without either the 'fields' attribute or the 'exclude' attribute is deprecated - form RuleAdminForm needs updating
Update forms.py

https://docs.djangoproject.com/en/dev/releases/1.6/#modelform-without-fields-or-exclude
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Using the Meta.exclude option is strongly discouraged.
Choices:
1) fields = ['robot', 'allowed', 'disallowed', 'sites', 'crawl_delay']
2) fields = "__all__"
Update forms.py
Merge pull request #19 from jscott1971/patch-1

Update forms.py