Nestjs version 8 is not supported

[SeyranPH]

Issue type:

• question
• bug report
• feature request
• documentation issue

nestjs-config version
Version tag: 1.4.5

• @nestjs/common: 8.2.6
• @nestjs/core: 8.2.6

Excepted behavior

It seems that nestjs-common doesn't support nestjs version 8.

Actual behavior or outcome (for issue)

Importing and injecting configService from nestjs-config is not supported.

Replication/Example

crypto.service.ts file

import { Injectable, Inject } from '@nestjs/common';
import * as crypto from 'crypto';
import { ConfigService } from 'nestjs-config';

@Injectable()
export class CryptoService {
  constructor(@Inject('ConfigService') private readonly configService: ConfigService) {}

  createHash(data: string, secret: string): string {
    // creating hmac object
    const hmac = crypto.createHmac('sha256', secret);
    // passing the data to be hashed
    const hash = hmac.update(data);
    // Creating the hmac in the required format
    const resultInBase64 = hash.digest('base64');

    return resultInBase64;
  }

  createMD5Hash(data: string): string {
    const md5 = crypto.createHash('md5').update(data).digest('hex');

    return md5;
  }
}

This is working properly with nestjs version 7. However with nestjs version 8 I'm getting an error.
The error message I'm getting:

Nest can't resolve dependencies of the CryptoService (?). Please make sure that the argument ConfigService at index [0] is available in the CryptoModule context.

    Potential solutions:
    - If ConfigService is a provider, is it part of the current CryptoModule?
    - If ConfigService is exported from a separate @Module, is that module imported within CryptoModule?
      @Module({
        imports: [ /* the Module containing ConfigService */ ]
      })

      at TestingInjector.lookupComponentInParentModules (../node_modules/@nestjs/core/injector/injector.js:202:19)
      at TestingInjector.resolveComponentInstance (../node_modules/@nestjs/core/injector/injector.js:157:33)
      at TestingInjector.resolveComponentInstance (../node_modules/@nestjs/testing/testing-injector.js:16:45)
      at resolveParam (../node_modules/@nestjs/core/injector/injector.js:108:38)
          at async Promise.all (index 0)
      at TestingInjector.resolveConstructorParams (../node_modules/@nestjs/core/injector/injector.js:123:27)
      at TestingInjector.loadInstance (../node_modules/@nestjs/core/injector/injector.js:52:9)
      at TestingInjector.loadProvider (../node_modules/@nestjs/core/injector/injector.js:74:9)
          at async Promise.all (index 3)

[ludovit-ubrezi]

Change @Inject('ConfigService') to @Inject(ConfigService) without '