Add 'query_timeout' to postgres dialectOptions

This option has existed in pg since v7.7 - see discussion at brianc/node-postgres#1760
Adding to properties to be passed to new connection config so it can be used with sequelize

lib/dialects/postgres/connection-manager.js

@@ -113,8 +113,10 @@ class ConnectionManager extends AbstractConnectionManager {
           // This should help with backends incorrectly considering idle clients to be dead and prematurely disconnecting them.
           // this feature has been added in pg module v6.0.0, check pg/CHANGELOG.md
           'keepAlive',
-          // Times out queries after a set time in milliseconds. Added in pg v7.3
+          // Times out db statments after a set time in milliseconds. Added in pg v7.3
           'statement_timeout',
+          // Times out requests after set time in milliseconds (client side). Added in pg v7.7
+          'query_timeout'
           // Terminate any session with an open transaction that has been idle for longer than the specified duration in milliseconds. Added in pg v7.17.0 only supported in postgres >= 10
           'idle_in_transaction_session_timeout'
         ]));