Add a tab-completion for "SELECT <sth> INTO" or "SELECT <sth> FROM" in psql

Hi,

I use tab-completion in psql quite often and I find that I can't complete
"FROM" for SELECT query.

So I try to create a patch for it.

I download the source code from GitHub master branch and modify the file to
create the patch.

I compile the code and my code change works like follows,
--------------------------------------------------------------
postgres=# SELECT * <Tab Key><Tab Key>
FROM INTO
postgres=# SELECT *
--------------------------------------------------------------

This is my first patch contribution trial here, please correct me if there
is something wrong.

Thanks.

CCHsu