Do not use attrs 21.1.0

Attrs 21.1.0 does not work with Python 3.4. The release has been yanked from pypi, but will still get used sometimes, so specify not to install 21.1.0. Signed-off-by: Chris Marchbanks <[email protected]>
prometheus · May 28, 2021 · 269bbde · 269bbde
1 parent e18828f
commit 269bbde
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/tox.ini b/tox.ini
@@ -6,6 +6,8 @@ envlist = coverage-clean,py2.7,py3.4,py3.5,py3.6,py3.7,py3.8,py3.9,pypy2.7,pypy3
 deps =
     coverage
     pytest
+; Python 3.4 fails if using 21.1.0.
+    attrs!=21.1.0
 
 [testenv:py2.7]
 deps =