setup.py: enforce django-polymorphic 0.7.1 for Django 1.8 compatibility

Author: vdboor

setup.py

@@ -36,9 +36,9 @@ def find_version(*parts):
  license='Apache 2.0',
 
  install_requires=[
- 'django-polymorphic>=0.7', # ensure Django 1.8 compatibility
- 'django-mptt>=0.6.0',
- 'django-tag-parser>=2.1', # ensure Django 1.8 compatibility
+ 'django-polymorphic>=0.7.1', # ensure Django 1.8 compatibility
+ 'django-mptt>=0.6.0', # Still allow 0.6 to have Django 1.5 support
+ 'django-tag-parser>=2.1',  # ensure Django 1.8 compatibility
  'future>=0.12.2',
  ],
  requires=[