[javascript-flowtyped] Enum (uniontype) not excaped properly

Created by: shfx

Description

When openapi contains a enum type for any of the attributes and this enum contains ', enum union type is not escaped properly.

e.g.

export type CountriesHumanNameEnum = 'Andorra' | 'United Arab Emirates' | 'Afghanistan' | 'Antigua and Barbuda' | 'Anguilla' | 'Albania' | 'Armenia' | 
'Cote d'Ivoire' | // <- Here
'Mayotte' | 'South Africa' | 'Zambia' | 'Zimbabwe';

openapi-generator version

3.1.1-SNAPSHOT

Command line used for generation

openapi-generator generate -i https://example.com/api.json -g javascript-flowtyped -o openapi/client

Steps to reproduce

1. Generate client code
2. yarn
3. yarn run build

Suggest a fix/enhancement

Escape string union types generated by openapi-generator