Merge pull request #1361 from schu/schu/update-mimic-iv-sqlite-import-py-requirements

mimic-iv/buildmimic/sqlite/README: mention sqlalchemy requirement

Author: alistairewj

mimic-iv/buildmimic/sqlite/README.md

@@ -17,6 +17,7 @@ into memory. It only needs three things to run:
 1. Python 3 installed
 2. SQLite
 3. [pandas](https://pandas.pydata.org/)
+4. [sqlalchemy](https://www.sqlalchemy.org/)
 
 ## Step 1: Download the CSV or CSV.GZ files.