Add version pins needed by bin/buildout on Python 2.

versions.cfg

@@ -26,6 +26,8 @@ collective.recipe.cmd = 0.11
 collective.recipe.sphinxbuilder = 1.1
 collective.recipe.template = 2.1
 colorama = 0.4.1
+configparser = 3.7.4
+contextlib2 = 0.5.5
 coverage = 4.5.4
 docutils = 0.15.2
 filelock = 3.0.12
@@ -37,6 +39,7 @@ manuel = 1.10.1
 mr.developer = 2.0.0
 nose = 1.3.7
 packaging = 19.1
+pathlib2 = 2.3.4
 pip = 19.2.1
 pkginfo = 1.5.0.1
 plone.recipe.command = 1.1
@@ -49,6 +52,7 @@ readme-renderer = 24.0
 repoze.sphinx.autointerface = 0.8
 requests = 2.22.0
 requests-toolbelt = 0.9.1
+scandir = 1.10.0
 snowballstemmer = 1.9
 soupsieve = 1.9.2
 sphinx-rtd-theme = 0.4.3