Attempt to fix Python 3.6 build on Travis.

.travis.yml

@@ -34,7 +34,7 @@ matrix:
         - ENV=mysql
         - OLDZODB=true
 
-    - python: pypy-5.4.1
+    - python: pypy-5.6.0
       env: ENV=mysql
 
     - python: 3.5

setup.py

@@ -128,11 +128,12 @@ setup(
             'ZODB >= 4.4.3',
             'ZEO >= 4.3.1',
         ],
-        ":python_full_version == '3.6.0rc1'": [
+        ":python_full_version == '3.6.0rc1' or python_full_version == '3.6.2rc1'": [
             # For some reason ZEO isn't getting installed
-            # on 3.6rc1/pip 9.0.1/tox 2.5.1. Looks like the
+            # on 3.6rc1/pip 9.0.1/tox 2.5.1, or 3.6.2rc1. Looks like the
             # version selection <, >= environment markers aren't working.
             # So we give a full version spec, which seems to work.
+            # We see this on Travis especially.
             'ZODB >= 4.4.3',
             'ZEO >= 4.3.1',
         ],