Error reading parquet from s3 with s3fs >= 0.3.0
#### Code Sample, a copy-pastable example if possible

```python
import pandas as pd

df = pd.read_parquet('s3://my-bucket/df.parquet')
```

Raises

```
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/.../pandas/io/parquet.py", line 294, in read_parquet
    return impl.read(path, columns=columns, **kwargs)
  File "/.../pandas/io/parquet.py", line 192, in read
    parquet_file = self.api.ParquetFile(path, open_with=s3.s3.open)
AttributeError: 'S3File' object has no attribute 's3'
```

#### Problem description

In version 0.3.0 s3fs removed the `S3File.s3` attribute. It is replaced by `S3File.fs` (which is inherited from `fsspec.AbstractBufferedFile.fs`.

Should pandas check the s3fs version and call the right attribute based on that?

#### Output of ``pd.show_versions()``

<details>

INSTALLED VERSIONS
------------------
commit           : None
python           : 3.7.3.final.0
python-bits      : 64
OS               : Darwin
OS-release       : 18.6.0
machine          : x86_64
processor        : i386
byteorder        : little
LC_ALL           : None
LANG             : en_US.UTF-8
LOCALE           : en_US.UTF-8

pandas           : 0.25.0
numpy            : 1.17.0
pytz             : 2019.1
dateutil         : 2.8.0
pip              : 19.2.1
setuptools       : 41.0.1
Cython           : None
pytest           : 4.4.1
hypothesis       : None
sphinx           : 2.1.2
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : None
html5lib         : None
pymysql          : None
psycopg2         : 2.8.3 (dt dec pq3 ext lo64)
jinja2           : 2.10.1
IPython          : None
pandas_datareader: None
bs4              : None
bottleneck       : None
fastparquet      : 0.3.1
gcsfs            : None
lxml.etree       : None
matplotlib       : None
numexpr          : None
odfpy            : None
openpyxl         : None
pandas_gbq       : None
pyarrow          : None
pytables         : None
s3fs             : 0.3.1
scipy            : 1.3.0
sqlalchemy       : 1.3.5
tables           : None
xarray           : None
xlrd             : None
xlwt             : None
xlsxwriter       : None

</details>
