Update README.md

fix typo

README.md

@@ -91,7 +91,7 @@ A curated list of notable ETL (extract, transform, load) frameworks, libraries a
 * http://tech.adroll.com/blog/data/2015/10/15/luigi.html?adrolldev
 
 ## Cloud Services
-* [Alterxy](http://www.alteryx.com/) - Cloud ETL tool with an interface similar to GUI ETL tools.
+* [Alteryx](http://www.alteryx.com/) - Cloud ETL tool with an interface similar to GUI ETL tools.
 * [AWS Data Pipeline](https://aws.amazon.com/datapipeline/) - "a web service that helps you reliably process and move data between different AWS compute and storage services, as well as on-premise data sources, at specified intervals."
 * [AWS Glue](https://aws.amazon.com/glue/) - AWS Glue generates the code (using Python and Spark) to execute your data transformations and data loading processes.
 * [Amazon Simple Workflow Service (SWF)](https://aws.amazon.com/swf/) - "helps developers build, run, and scale background jobs that have parallel or sequential steps. You can think of Amazon SWF as a fully-managed state tracker and task coordinator in the Cloud."