Describe the bug
When using the generate-entities the emitted classes don't include the collection name on the entity.

Stack trace

(node:3691) UnhandledPromiseRejectionWarning: TableNotFoundException: select count(distinct("e0"."id")) as "count" from "f20181234" as "e0" - relation "f20181234" does not exist

To Reproduce
Steps to reproduce the behavior:

sql

CREATE TABLE f2018_1234(
    id INT NOT NULL,
    PRIMARY KEY (id)
)

command

npx mikro-orm generate-entities --dump

got

@Entity()
export class F20181234 {

  @PrimaryKey()
  id!: number;

}

expected

@Entity({collection: 'f2018_1234'})
export class F20181234 {

  @PrimaryKey()
  id!: number;

}

Expected behavior
Ideally the generated classes would map back to the tables in the source database.

Additional context
Not sure if I'm missing something with args or this is expected behavior

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