fix: Fixed package versioning of databases (#39)

Author: frgfm

requirements.txt

@@ -1,6 +1,6 @@
 fastapi==0.61.1
 uvicorn>=0.11.1
-databases[postgresql]>=0.2.6
+databases[postgresql]>=0.2.6,<=0.4.0
 SQLAlchemy>=1.3.12
 python-jose>=3.2.0
 passlib[bcrypt]>=1.7.4