Add AWS blog post on README.md

Author: igorborgest

README.md

@@ -123,6 +123,7 @@ wr.db.to_sql(df, engine, schema="test", name="my_table")
 
 Please [send a Pull Request](https://github.com/awslabs/aws-data-wrangler/edit/master/README.md) with your resource reference and @githubhandle.
 
+* [Optimize Python ETL by extending Pandas with AWS Data Wrangler](https://aws.amazon.com/blogs/big-data/optimize-python-etl-by-extending-pandas-with-aws-data-wrangler/)
 * [Reading Parquet Files With AWS Lambda](https://aprakash.wordpress.com/2020/04/14/reading-parquet-files-with-aws-lambda/)
 * [Transform AWS CloudTrail data using AWS Data Wrangler](https://aprakash.wordpress.com/2020/09/17/transform-aws-cloudtrail-data-using-aws-data-wrangler/)
 * [Getting started on AWS Data Wrangler and Athena](https://medium.com/@dheerajsharmainampudi/getting-started-on-aws-data-wrangler-and-athena-7b446c834076) [[@dheerajsharma21](https://github.com/dheerajsharma21)]