support next rev of bot_io
licence nit
lock down google_oauth2_client version constraint
Ensure uploads specify uploadType query param

Previously, this was not specified resulting in inconsistent behaviour
and zero size files.

Resolves
https://github.com/dart-gde/discovery_api_dart_client_generator/issues/1
13
Merge pull request #114 from MarkBennett/master

Ensure uploads specify uploadType query param
Releasing 0.4.5