Pin virtualenv to <20 as workaround for #1998.

a99aeb82 · Jason R. Coombs · 0559f17d · a99aeb82
Commit a99aeb82 authored Feb 15, 2020 by Jason R. Coombs
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tox.ini tox.ini +2 -0

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--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,8 @@ envlist=python
 minversion = 3.2
 requires =
 	tox-pip-version >= 0.0.6
+	# workaround for #1998
+	virtualenv < 20

 [helpers]
 # Custom pip behavior