Issue type:

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

Database system/driver:

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

TypeORM version:

[*] latest (0.2.18 for reference)
[ ] @next
[ ] 0.x.x (or put your version here)

Steps to reproduce or a small repository showing the problem:

I am encountering an odd issue where providing an enum of strings with an apostrophe in it is not being escaped, so the SQL fails. A small repository that demonstrates the issue along with the full error is here.

export enum Realm {
  Nerzhul = "Ner'zhul",
}

@Entity("character")
export class Character {
  @PrimaryGeneratedColumn()
  id: number;

  @Column({ type: "enum", enum: Realm })
  realm: Realm;
}

Produces the following incorrect query string for the realm column type:
CREATE TYPE "character_realm_enum" AS ENUM('Ner'zhul')

Trying to format the enum differently or escape it in the code did not help, Typeorm always generated incorrect migrations. I also don't know how to stop Typeorm from trying to create migrations for this field. Any help is appreciated.