Feathers upgrade adds authentication-oauth to the package

[shawnemhe]

Steps to reproduce

1. Generate and app with feathers generate app without authentication
2. Run feathers upgrade

Expected behavior

Feathers will upgrade only existing packages and features

Actual behavior

The CLI adds @feathersjs/authentication-oauth to dependencies in package.json and an authentication configuration to config/default.json

System configuration

Working in a feathers app generated by the CLI, but with authentication not yet added.

Module versions (especially the part that's not working):
N/A
NodeJS version:
v12.16.1
Operating System:
Win 10
Browser Version:
N/A
React Native Version:
N/A
Module Loader:
N/A