LoadEvent is not exported by typeorm

[saulotoledo]

Issue type:

[ ] question
[X] bug report
[ ] feature request
[ ] documentation issue

Database system/driver:

[X] cordova
[X] mongodb
[X] mssql
[X] mysql / mariadb
[X] oracle
[X] postgres
[X] cockroachdb
[X] sqlite
[X] sqljs
[X] react-native
[X] expo

TypeORM version:

[X] latest
[ ] @next
[ ] 0.x.x (or put your version here)

Steps to reproduce or a small repository showing the problem:

The following imports are available in TypeORM:

import { InsertEvent, LoadEvent, UpdateEvent } from 'typeorm';

But for the LoadEvent we need to do the following:

import { LoadEvent } from 'typeorm/subscriber/event/LoadEvent';

I believe that LoadEvent should be exported in the same way as previous imports.