not release client from pool

[royigoldi]

Hi,

I used your library and I saw that my node server stuck on Postgres queries.
The exception is "Connection terminated".
I start look at your's source code in the database-client.js and I saw:
in the ensureConnection() method you that use from query/execute/querySingle
you got object from the pool.connect() but you never call to the release function on it to return it to the pool after you finished the execution.

Thanks,
Royi