Update README.md

Author: krzjoa

README.md

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 ### Data Frames
 * [pandas](https://pandas.pydata.org/pandas-docs/stable/) - Powerful Python data analysis toolkit.
 * [polars](https://github.com/pola-rs/polars) - A fast multi-threaded, hybrid-out-of-core DataFrame library.
-* [koalas](https://github.com/databricks/koalas) - pandas API on Apache Spark. <img height="20" src="img/pandas_big.png" alt="pandas compatible">
 * [Arctic](https://github.com/manahl/arctic) - High-performance datastore for time series and tick data.
 * [datatable](https://github.com/h2oai/datatable) - Data.table for Python. <img height="20" src="img/R_big.png" alt="R inspired/ported lib">
 * [pandas_profiling](https://github.com/pandas-profiling/pandas-profiling) - Create HTML profiling reports from pandas DataFrame objects