Lock in django-jsonfield (fixes GH-1648)

Author: dcramer

setup.py

@@ -74,7 +74,7 @@
     'django-bitfield>=1.7.0,<1.8.0',
     'django-crispy-forms>=1.4.0,<1.5.0',
     'django-paging>=0.2.5,<0.3.0',
-    'django-jsonfield>=0.9.13,<0.10.0',
+    'django-jsonfield>=0.9.13,<0.9.14',
     'django-picklefield>=0.3.0,<0.4.0',
     'django-recaptcha>=1.0.0,<1.1.0',
     'django-social-auth>=0.7.28,<0.8.0',