Add "client_authentication" parameter to index.d.ts

[andioli]

First of all, thank you for adding basic authentication with #1060.

Yet, the client_authentication parameter is still missing in the index.d.ts file. It would be great, if you could add this line:
client_authentication: string to OidcClientSettings.

Without this parameter, it's not really usable with Typescript projects.

Thanks in advance! :)

[brockallen]

Feel free to send a PR, please?

[frontendplace]

it should be: client_authentication? : string

can anybody make PR for this: in node_modules/oidc-client/index.d.ts
I am not allowed to push changes

line 126:
export interface OidcClientSettings {
/** The URL of the OIDC/OAuth2 provider /
authority?: string;
readonly metadataUrl?: string;
/* Provide metadata when authority server does not allow CORS on the metadata endpoint /
metadata?: Partial;
/* Provide signingKeys when authority server does not allow CORS on the jwks uri /
signingKeys?: any[];
/* Your client application's identifier as registered with the OIDC/OAuth2 /
client_id?: string;
client_secret?: string;
/* The DefaultClientAuthentication is 'client_secret_post' and can be set back to standard 'client_secret_basic' /
client_authentication? : string
/* The type of response desired from the OIDC/OAuth2 provider (default: 'id_token') */

[willmcclellan]

Added this in #1390