Update pg-cursor

pg-cursor no longer returns the empty array 'done' signal to the callback
until the cursor recieves a readyForQuery message.  This means pg-query-stream
will not emit 'close' or 'end' events until the server is __truly__ ready for
the next query.  This fixes some race-conditions where some queries
are triggered off of the `end` event of the query-stream

closes #3
Bump version