We just added CPython 3.9.0 to the automation environment. Let's
support actions targeting it.
One side-effect of this change is that we'll produce Windows wheels
for Python 3.9 by default. This is desirable.
| pulkit | 
| hg-reviewers | 
We just added CPython 3.9.0 to the automation environment. Let's
support actions targeting it.
One side-effect of this change is that we'll produce Windows wheels
for Python 3.9 by default. This is desirable.
| Automatic diff as part of commit; lint not applicable. | 
| Automatic diff as part of commit; unit tests not applicable. |