Making sure `readme` is up-to-date

README.md

@@ -4,9 +4,11 @@ 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.
-
+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.