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update README to deprecation of do_flatten(flatten=True) #72

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Oct 2, 2018
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update README to deprecation of do_flatten(flatten=True) #72

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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -73,7 +73,7 @@ df = read_root('myfile.root', columns=['noexpand:sqrt(variable1)']
Working with stored arrays can be a bit inconventient in pandas.
`root_pandas` makes it easy to flatten your input data, providing you with a DataFrame containing only scalars:
```python
df = read_root('myfile.root', columns=['arrayvariable', 'othervariable'], flatten=True)
df = read_root('myfile.root', columns=['arrayvariable', 'othervariable'], flatten=['arrayvariable'])
```

Assuming the ROOT file contains the array `[1, 2, 3]` in the first `arrayvariable` column, flattening
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