Update to current versions according to checkversions.

ztk-versions.cfg

@@ -28,7 +28,7 @@ zope.exceptions = 4.3
 zope.filerepresentation = 4.2.0
 zope.formlib = 4.6.0
 zope.hookable = 4.2.0
-zope.i18n = 4.6.1
+zope.i18n = 4.6.2
 zope.i18nmessageid = 4.3.1
 zope.index = 4.4.0
 zope.interface = 4.6.0
@@ -52,7 +52,7 @@ zope.ramcache = 2.3
 zope.schema = 4.9.3
 zope.security = 4.3.1
 zope.securitypolicy = 4.3.1
-zope.sendmail = 4.2.1
+zope.sendmail = 5.0
 zope.session = 4.3.0
 zope.site = 4.2.2
 zope.size = 4.3
@@ -69,7 +69,7 @@ BTrees = 4.5.1
 persistent = 4.4.3
 python-gettext = 4.0
 pytz = 2018.9
-setuptools = 40.8.0
+setuptools = 41.0.0
 six = 1.12.0
 transaction = 2.4.0
 
@@ -92,8 +92,8 @@ extras = 1.0.0
 fixtures = 3.0.0
 linecache2 = 1.0.0
 manuel = 1.10.1
-pbr = 5.1.2
-pyparsing = 2.3.1
+pbr = 5.1.3
+pyparsing = 2.4.0
 python-mimeparse = 1.6.0
 python-subunit = 1.3.0
 testtools = 2.3.0
@@ -105,36 +105,37 @@ zodbpickle = 1.0.3
 
 
 # Testing tools
-coverage = 4.5.2
+coverage = 4.5.3
 nose = 1.3.7
 
 # Documentation dependencies
-Sphinx = 1.8.4
+# We have to keep a version < 2 to still support Python 2
+Sphinx = 1.8.5
 docutils = 0.14
 imagesize = 1.1.0
 alabaster = 0.7.12
 babel = 2.6.0
-Jinja2 = 2.10
-MarkupSafe = 1.1.0
+Jinja2 = 2.10.1
+MarkupSafe = 1.1.1
 Pygments = 2.3.1
 snowballstemmer = 1.2.1
-lxml = 4.3.1
+lxml = 4.3.3
 repoze.sphinx.autointerface = 0.8
 requests = 2.21.0
-certifi = 2018.11.29
+certifi = 2019.3.9
 urllib3 = 1.24.1
 idna = 2.8
 chardet = 3.0.4
-sphinxcontrib-programoutput = 0.13
+sphinxcontrib-programoutput = 0.14
 sphinxcontrib-websupport = 1.1.0
-sphinx-rtd-theme = 0.4.2
+sphinx-rtd-theme = 0.4.3
 packaging = 19.0
 typing = 3.6.6
 z3c.recipe.sphinxdoc = 1.1.0
 
 # ZTK buildout dependencies
 collective.recipe.cmd = 0.11
-mr.developer = 1.38
+mr.developer = 2.0.0
 z3c.checkversions = 1.1
 z3c.recipe.compattest = 1.0
 zc.buildout = 2.13.1