EOFError on Gzipped CSV read from S3
Not sure if this is a Pandas issue or s3fs issue:
```python
import pandas as pd
data = pd.read_csv("s3://bucketname/file.csv.gz")
```

Gives the following error:
```
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/ubuntu/miniconda3/envs/test/lib/python3.7/site-packages/pandas/io/parsers.py", line 685, in parser_f
    return _read(filepath_or_buffer, kwds)
  File "/home/ubuntu/miniconda3/envs/test/lib/python3.7/site-packages/pandas/io/parsers.py", line 463, in _read
    data = parser.read(nrows)
  File "/home/ubuntu/miniconda3/envs/test/lib/python3.7/site-packages/pandas/io/parsers.py", line 1154, in read
    ret = self._engine.read(nrows)
  File "/home/ubuntu/miniconda3/envs/test/lib/python3.7/site-packages/pandas/io/parsers.py", line 2059, in read
    data = self._reader.read(nrows)
  File "pandas/_libs/parsers.pyx", line 881, in pandas._libs.parsers.TextReader.read
  File "pandas/_libs/parsers.pyx", line 896, in pandas._libs.parsers.TextReader._read_low_memory
  File "pandas/_libs/parsers.pyx", line 950, in pandas._libs.parsers.TextReader._read_rows
  File "pandas/_libs/parsers.pyx", line 937, in pandas._libs.parsers.TextReader._tokenize_rows
  File "pandas/_libs/parsers.pyx", line 2124, in pandas._libs.parsers.raise_parser_error
  File "/home/ubuntu/miniconda3/envs/test/lib/python3.7/_compression.py", line 68, in readinto
    data = self.read(len(byte_view))
  File "/home/ubuntu/miniconda3/envs/test/lib/python3.7/gzip.py", line 482, in read
    raise EOFError("Compressed file ended before the "
EOFError: Compressed file ended before the end-of-stream marker was reached
```

### Setup
Installed Pandas and s3fs via pip:
```bash
pip install pandas s3fs
```
**Pandas version:** 0.25.1
**s3fs version:** 0.3.3