Reorder install instructions in CONTRIBUTING.md

CONTRIBUTING.md

@@ -436,12 +436,12 @@ pip install -r requirements/testing.txt
 # Install Superset in editable (development) mode
 pip install -e .
 
-# Create an admin user in your metadata database (use `admin` as username to be able to load the examples)
-superset fab create-admin
-
 # Initialize the database
 superset db upgrade
 
+# Create an admin user in your metadata database (use `admin` as username to be able to load the examples)
+superset fab create-admin
+
 # Create default roles and permissions
 superset init