pandas-datareader

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There are cases in yahoo data where there are duplicated rows, this simple fix will remove the second duplicated row if it exists. A stack overflow thread that contains people facing this error is https://stackoverflow.com/questions/57885790/valueerror-index-contains-duplicate-entries-cannot-reshape-pandas-datareader

• [ ] closes #xxxx
• [ ] tests added / passed
• [ ] passes git diff upstream/master -u -- "*.py" | flake8 --diff
• [ ] passes black --check pandas_datareader
• [ ] added entry to docs/source/whatsnew/vLATEST.txt

What if the values differ but he index doesn't? Should PDR return what Yahoo does?

I think you should only drop if the row is identical and the index is identical.