feat(types): convert type 'OctokitOptions' to interface (#450)

Author: oscard0m

src/types.ts

@@ -5,7 +5,7 @@ import { Octokit } from ".";
 
 export type RequestParameters = OctokitTypes.RequestParameters;
 
-export type OctokitOptions = {
+export interface OctokitOptions {
   // TODO: add types for authStrategy & auth options and octokit.auth() method,
   //       see https://tinyurl.com/typescript-auth-strategies
   authStrategy?: any;
@@ -22,7 +22,7 @@ export type OctokitOptions = {
   request?: OctokitTypes.RequestRequestOptions;
   timeZone?: string;
   [option: string]: any;
-};
+}
 
 export type Constructor<T> = new (...args: any[]) => T;