message: Fix a typo in readme, change text to pcap
diff: @@ -28,7 +28,7 @@ At the moment TensorFlow I/O supports the following data sources:
  - `tensorflow_io.grpc`: gRPC server Dataset, support for streaming Numpy input.
  - `tensorflow_io.hdf5`: HDF5 file format support.
  - `tensorflow_io.text`: Text file with archive support.
  -- `tensorflow_io.text`: Pcap network packet capture file support.
  +- `tensorflow_io.pcap`: Pcap network packet capture file support.
  - `tensorflow_io.azure`: Microsoft Azure Storage support. Usage guide [here](https://github.com/tensorflow/io/blob/master/tensorflow_io/azure/README.md).
  - `tensorflow_io.bigquery`: Google Cloud BigQuery support.
  - `tensorflow_io.gcs`: GCS Configuration support.
  