Test on Plone 5.2 different Python versions

[ale-rt]

No description provided.

[ale-rt]

I checked Plone 5.2 locally with this patch

diff --git a/buildout.cfg b/buildout.cfg
index 3026c2e..9ebcf9f 100644
--- a/buildout.cfg
+++ b/buildout.cfg
@@ -1,6 +1,6 @@
 [buildout]
 extends =
-    https://raw.githubusercontent.com/collective/buildout.plonetest/master/test-5.1.x.cfg
+    https://raw.githubusercontent.com/collective/buildout.plonetest/master/test-5.2.x.cfg
     versions.cfg
 parts +=
     docs
diff --git a/requirements.txt b/requirements.txt
index bba2416..4ad8c83 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1 @@
-setuptools==33.1.1
-zc.buildout==2.12.1
+-r https://dist.plone.org/release/5.2-latest/requirements.txt

and things worked pretty well.
I am not sure if it is worth the effort to keep testing in travis both Plone 5.1 and Plone 5.2 (Builds will be very long).