fix(authService): allow object passed as second arg to authService.lo…

…gin()

modified the type of the second argument to allow string or object as the first argument to the login function does

src/authService.js

@@ -437,7 +437,7 @@ export class AuthService {
    *
    * @return {Promise<Object>|Promise<Error>}    Server response as Object
    */
-  login(emailOrCredentials: string|{}, passwordOrOptions?: string, optionsOrRedirectUri?: {}, redirectUri?: string): Promise<any> {
+  login(emailOrCredentials: string|{}, passwordOrOptions?: string|{}, optionsOrRedirectUri?: {}, redirectUri?: string): Promise<any> {
     let normalized = {};
 
     if (typeof emailOrCredentials === 'object') {