Add zest.releaser to ease releases.

buildout.cfg

@@ -42,6 +42,7 @@ recipe = zc.recipe.egg
 eggs =
     Zope
     tox
+    zest.releaser
 
 
 [zserverscripts]

versions.cfg

@@ -14,6 +14,7 @@ certifi = 2018.1.18
 chardet = 3.0.4
 collective.recipe.cmd = 0.11
 collective.recipe.sphinxbuilder = 1.0
+colorama = 0.3.9
 coverage = 4.4.2
 docutils = 0.14
 idna = 2.6
@@ -25,18 +26,21 @@ mr.developer = 1.38
 nose = 1.3.7
 packaging = 16.8
 pip = 9.0.1
+pkginfo = 1.4.1
 plone.recipe.command = 1.1
 pluggy = 0.6.0
 py = 1.5.2
 Pygments = 2.2.0
 pyparsing = 2.2.0
 python-gettext = 3.0
 requests = 2.18.4
+requests-toolbelt = 0.6.0
 setuptools = 38.4.0
 snowballstemmer = 1.2.1
 Sphinx = 1.6.6
 sphinxcontrib-websupport = 1.0.1
 tox = 2.9.1
+twine = 1.6.5
 typing = 3.6.4
 urllib3 = 1.22
 virtualenv = 15.1.0
@@ -45,3 +49,4 @@ z3c.checkversions = 0.5
 zc.buildout = 2.11.0
 zc.recipe.egg = 2.0.5
 zc.recipe.testrunner = 2.0.0
+zest.releaser = 6.6.4