Tests(tox): Limit `VIRTUALENV_PIP` version for Python 3.4

diff --git a/tox.ini b/tox.ini
index 9f7265714b265b4b3f0986146697ce74aec650a2..2c2c213abf8fa5a992444bcfce097180b4bd3b50 100644 (file)
--- a/tox.ini
+++ b/tox.ini
@@ -18,6 +18,8 @@ commands =
     {envpython} -c "import struct; print(struct.calcsize('P') * 8)"
 deps =
     -rdevscripts/requirements/requirements_tests.txt
+setenv =
+    VIRTUALENV_PIP = 19.1.1
 
 [testenv:{py27,py34,py35,py36,py37,py38,py39,pypy}]
 commands =