remove stale dependency on "sure"

Author: a-detiste

setup.py

@@ -413,7 +413,7 @@ def run_setup(extensions):
         include_package_data=True,
         install_requires=dependencies,
         extras_require=_EXTRAS_REQUIRE,
-        tests_require=['pytest', 'PyYAML', 'pytz', 'sure'],
+        tests_require=['pytest', 'PyYAML', 'pytz'],
         classifiers=[
             'Development Status :: 5 - Production/Stable',
             'Intended Audience :: Developers',

tests/integration/cqlengine/test_timestamp.py

@@ -14,7 +14,6 @@
 
 from datetime import timedelta, datetime
 from unittest import mock
-import sure
 from uuid import uuid4
 
 from cassandra.cqlengine import columns