Update enum

[morenoh149]

When installing another package (pip install dbt) I get an error

  AttributeError: module 'enum' has no attribute 'IntFlag'

tracking dbt-labs/dbt-core#2372

If I run

$ pip show enum34
Name: enum34
Version: 1.1.9
Summary: Python 3.4 Enum backported to 3.3, 3.2, 3.1, 2.7, 2.6, 2.5, and 2.4
Home-page: https://bitbucket.org/stoneleaf/enum34
Author: Ethan Furman
Author-email: ethan@stoneleaf.us
License: BSD License
Location: /Users/harrymoreno/.asdf/installs/python/3.7.3/lib/python3.7/site-packages
Requires: 
Required-by: intuit-oauth

we see that this intuit-oauth module needs to be updated for python 3.6+

Related
iterative/dvc#1995

[fjolin-intuit]

Hi @morenoh149 - We actually use enum-compat to handle this https://github.com/jstasiak/enum-compat. It should only be installed for anything older than Python 3.4. If you are using anything above Python 3.4 - you can simply uninstall enum34. This solution from this stack overflow is exactly how we handle it https://stackoverflow.com/questions/43124775/why-python-3-6-1-throws-attributeerror-module-enum-has-no-attribute-intflag/45716067#45716067

If you need the code to run on python versions both <=3.4 and >3.4, you can try having enum-compat as a requirement. It only installs enum34 for older versions of python without the standard library enum.

[morenoh149]

fwiw imo the default should support the latest python for new users of this lib. If someone is on an older version of python they should require to add a compatibility layer.