Merge pull request #37 from zbrookle/update_documentation

DOC: Fix license link

Author: zbrookle

README.md

@@ -2,9 +2,10 @@
 
 ![CI](https://github.com/zbrookle/dataframe_sql/workflows/CI/badge.svg)
 [![Downloads](https://pepy.tech/badge/dataframe-sql)](https://pepy.tech/project/dataframe-sql)
-[![PyPI license](https://img.shields.io/pypi/l/dataframe_sql.svg)](https://pypi.python.org/pypi/dataframe_sql/)
+[![PyPI license](https://img.shields.io/pypi/l/dataframe_sql.svg)](https://github.com/zbrookle/dataframe_sql/blob/master/LICENSE.txt)
 [![PyPI status](https://img.shields.io/pypi/status/dataframe_sql.svg)](https://pypi.python.org/pypi/dataframe_sql/)
 [![PyPI version shields.io](https://img.shields.io/pypi/v/dataframe_sql.svg)](https://pypi.python.org/pypi/dataframe_sql/)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 ## Installation
 

dataframe_sql/tests/pandas_sql_functionality_test.py

@@ -382,7 +382,8 @@ def test_having_multiple_conditions():
 
 
 @pytest.mark.xfail(
-    raises=ValueError, reason="Still can't do having without a group by in ibis",
+    raises=ValueError,
+    reason="Still can't do having without a group by in ibis",
 )
 def test_having_one_condition():
     """