Edit details for database

README.md

 
 ```ini
 [postgresql]
-host=<Hname>
-database=<dbname>
+host=<Hostname>
+database=<Database>
 user=<Username>
 password=<Password>
 ```
 
-This file is based on an example from [the postgresSQL website](http://www.postgresqltutorial.com/postgresql-python/connect/). Replace `<Username>` and `<Password>` with valid credentials.
+This file is based on an example from [the postgresSQL website](http://www.postgresqltutorial.com/postgresql-python/connect/). Replace `<Hostname>`, `<Database>`, `<Username>` and `<Password>` with valid credentials.
 
 ## SQL