add pytest to reqs

Author: sasha-scale

requirements.txt

@@ -1,13 +1,22 @@
 # Automatically generated by https://github.com/damnever/pigar.
 
+# nucleus-python-client/conftest.py: 8
 # nucleus-python-client/nucleus/__init__.py: 63
 grequests == 0.6.0
 
+# nucleus-python-client/conftest.py: 15,33
+# nucleus-python-client/tests/test_dataset.py: 1
+pytest == 6.2.2
+
+# nucleus-python-client/conftest.py: 14
 # nucleus-python-client/nucleus/__init__.py: 64,65,68
 requests == 2.22.0
 
 # nucleus-python-client/setup.py: 1
 setuptools == 46.0.0
 
 # nucleus-python-client/nucleus/__init__.py: 60,61
-tqdm == 4.54.1
+tqdm == 4.51.0
+
+# nucleus-python-client/tests/test_dataset.py: 1
+pytest == 6.2.2