Requests MissingSchema Error when downloading file #271

Hi!

I'm having trouble downloading a file from SharePoint using the latest 2.2.1 version of Office365. When I try to download a file a "MissingSchema" Error from the requests module appears. I don't know what happened, if I go back to version 2.1.5 the code runs fine. Thank you very much and I appreciate the hard work in this module; super useful!

from office365.runtime.auth.authentication_context import AuthenticationContext
from office365.sharepoint.client_context import ClientContext
from office365.sharepoint.file import File

def auth(username, password):
    ctx_auth = AuthenticationContext(url)
    if ctx_auth.acquire_token_for_user(username, password):
      ctx = ClientContext(url, ctx_auth)
      return ctx

ctx = auth(username, password)
response = File.open_binary(ctx, relative_url)

Error:
MissingSchema: Invalid URL "<bound method ClientContext.service_root_url of <office365.sharepoint.client_context.ClientContext object at 0x7fb4e44c3d90>>web/getfilebyserverrelativeurl('MYRELATIVEURL')/\\$value": No schema supplied. Perhaps you meant http://<bound method ClientContext.service_root_url of <office365.sharepoint.client_context.ClientContext object at 0x7fb4e44c3d90>>web/getfilebyserverrelativeurl('MYRELATIVEURL')/\$value?

Using MacOS,
Office365 2.2.1,
Python 3.8.3,
requests 2.2.4