Removes un-needed pandas and pytest-monkeytype from dev-packages

Switch test_to_dataframe to use a mocked pandas dataframe instead

Author: aaront

Pipfile

@@ -13,8 +13,6 @@ pytest-asyncio = "*"
 requests-mock = "*"
 pytest-datadir = "*"
 pytest-benchmark = "*"
-pytest-monkeytype = "*"
-pandas = "*"
 types-requests = "*"
 types-pytz = "*"
 types-setuptools = "*"