fixed pymongo version to be > 3.0

Author: Mark Unsworth

requirements.txt

@@ -1,4 +1,4 @@
-pymongo
+pymongo>=3.0
 https://github.com/django-nonrel/djangotoolbox/tarball/master
 https://github.com/django-nonrel/django/tarball/nonrel-1.5
 https://github.com/django-nonrel/django-dbindexer/tarball/master

setup.py

@@ -17,7 +17,7 @@
     license='2-clause BSD',
     description=DESCRIPTION,
     long_description=LONG_DESCRIPTION,
-    install_requires=['pymongo', 'djangotoolbox>=1.6.0'],
+    install_requires=['pymongo>=3.0', 'djangotoolbox>=1.6.0'],
     packages=find_packages(exclude=['tests', 'tests.*']),
     zip_safe=False,
     classifiers=[