Revert "tests: allow prerelease deps on Python 3.9 (#207)"

tseaver · web-flow · commit e0f6f4fdd82a · 2021-08-17T13:57:37.000-04:00
This reverts commit cf77e60.
diff --git a/testing/constraints-3.9.txt b/testing/constraints-3.9.txt
@@ -1,2 +0,0 @@
-# Allow prerelease requirements
---pre

Original file line number	Diff line number	Diff line change
`@@ -1,2 +0,0 @@`
`1`		`-# Allow prerelease requirements`
`2`		`---pre`