Added boto3 to test dependencies

setup.py

@@ -42,6 +42,7 @@ testing_extras = [
     'Pillow>=2.7.0',
     'elasticsearch>=1.0.0',
     'Jinja2>=2.8,<3.0',
+    'boto3>=1.1,<1.2',
 
     # For coverage and PEP8 linting
     'coverage>=3.7.0',