BREAKING CHANGE Default timeout for token requests.
The edx-rest-api-client fetches tokens as a part of making requests. Previously this
had no associated timeout and would wait forever to get a response from the
access_token request. We now set a default timeout of 3.1 seconds to make the
connection to the server and 1 second to get data back.
Version 5.0.0 was not released because of docs issues.