Update README.md

README.md

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 SleepECG provides tools for sleep stage classification when [EEG](https://en.wikipedia.org/wiki/Electroencephalography) signals are not available. Based only on [ECG](https://en.wikipedia.org/wiki/Electrocardiography) (and to a lesser extent also movement data), SleepECG provides functions for
 - downloading and reading open polysomnography datasets,
 - detecting heartbeats from ECG signals, and
-- classifying sleep stages (which includes the entire preprocessing, feature extraction, and classification pipeline).
+- classifying sleep stages (which includes preprocessing, feature extraction, and classification).
 
 ### Documentation
 Documentation for SleepECG is available on [Read the Docs](https://sleepecg.readthedocs.io/en/stable/index.html).