Making sure `readme` is up-to-date

README.md

@@ -5,8 +5,10 @@ The website for the Chicago Summer of Learning, developed by Ocupop and Mozilla.
 ## Environment
 
 Property        | Default  | Description
--------|-------|----------
+----------------|----------|-------------------------
 `CSOL_DB_NAME`  | `"csol"` | Name of the database.
 `CSOL_DB_USER`  | `"root"` | Database username.
 `CSOL_DB_PASS`  | `null`   | Database password.
-
+`CSOL_DB_HOST`  | `null`   | Database host.
+`CSOL_DB_PORT`  | `null`   | Database port.
+`COOKIE_SECRET` | `null`   | Seed for session cookie.