Update README.md

Author: gmenegatti

README.md

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 # SlicingDice Official Python Client (v2.0.1) 
 
-Official Python client for [SlicingDice - Data Warehouse and Analytics Database as a Service](http://www.slicingdice.com/).
+Official Python client for [SlicingDice - Data Warehouse and Analytics Database as a Service](https://www.slicingdice.com/).
 
 [SlicingDice](http://www.slicingdice.com/) is a serverless, SQL & API-based, easy-to-use and really cost-effective alternative to Amazon Redshift and Google BigQuery.