Removed Error type since it blocks the rest from showing up

[DalerAsrorov]

While going over the apollo link example in https://www.apollographql.com/docs/link/links/context/,

  if (networkError && networkError.name ==='ServerError' && networkError.statusCode === 401) {
    // remove cached token on 401 from the server
    token = null;
  }

the statusCode property wasn't recognized in my editor:

I believe since both ServerError and ServerParseError already include Error with & operator:

export declare type ServerError = Error & {
    response: Response;
    result: Record<string, any>;
    statusCode: number;
};

export declare type ServerParseError = Error & {
    response: Response;
    statusCode: number;
    bodyText: string;
};

it should make sense to remove it. The TS lint error disappears and allows me to see the valid contents of the error.

• [x] Make sure all of new logic is covered by tests and passes linting
• [x] Update CHANGELOG.md with your change

[apollo-cla]

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