README missing Database Port number in the example.

Nobody has claimed this yet.

* **asyncpg version**:
* **PostgreSQL version**:
* **Do you use a PostgreSQL SaaS? If so, which? Can you reproduce
the issue with a local PostgreSQL install?**:
* **Python version**:
* **Platform**:
* **Do you use pgbouncer?**:
* **Did you install asyncpg with pip?**:
* **If you built asyncpg locally, which version of Cython did you use?**:
* **Can the issue be reproduced under both asyncio and
[uvloop](https://github.com/magicstack/uvloop)?**:

Not a bug or issue, I saw the example in the README section..

```
import asyncio
import asyncpg

async def run():
conn = await asyncpg.connect(user='user', password='password',
database='database', host='127.0.0.1')
values = await conn.fetch('''SELECT * FROM mytable''')
await conn.close()

loop = asyncio.get_event_loop()
loop.run_until_complete(run())
```
A database port number is missing in the example, I know Postgres default port is 5432, but in example if we give the details about the port it will be more clear to reader about the port parameter to use for different database instance.. Was it intentional to leave port number or its error ?

--Raghav

Open the README section containing the asyncpg.connect example and inspect how connection parameters are documented. Update the example to make the database port usage clear, then check that the code remains a valid PostgreSQL connection example. With no recent response for years, confirm the issue is still relevant before starting.

Written by the indexing model from the issue text.