Use futures = 3.3.0, backports.functools-lru-cache = 1.6.4, isort = 4.3.21

Author: gbastien

versions-dev.cfg

@@ -10,7 +10,9 @@ plone.recipe.codeanalysis = 3.0.1
 flake8 = 3.7.7
 flake8-isort = 2.2.1
 flake8-polyfill = 1.0.2
-isort = 4.2.0
+futures = 3.3.0
+backports.functools-lru-cache = 1.6.4
+isort = 4.3.21
 check-manifest = 0.37
 typing = 3.6.6
 pyflakes = 2.1.1