Don't test with devel versions

There's no chance this is going to work -- we've a lot of catching up to
do in this aspect.

Author: Hugo Osvaldo Barrera

.travis.yml

@@ -25,14 +25,6 @@
         "env": "BUILD=style",
         "python": "3.6"
       },
-      {
-        "env": "BUILD=test DAV_SERVER=radicale REQUIREMENTS=devel ",
-        "python": "3.5"
-      },
-      {
-        "env": "BUILD=test DAV_SERVER=xandikos REQUIREMENTS=devel ",
-        "python": "3.5"
-      },
       {
         "env": "BUILD=test DAV_SERVER=radicale REQUIREMENTS=release ",
         "python": "3.5"
@@ -49,14 +41,6 @@
         "env": "BUILD=test DAV_SERVER=xandikos REQUIREMENTS=minimal ",
         "python": "3.5"
       },
-      {
-        "env": "BUILD=test DAV_SERVER=radicale REQUIREMENTS=devel ",
-        "python": "3.6"
-      },
-      {
-        "env": "BUILD=test DAV_SERVER=xandikos REQUIREMENTS=devel ",
-        "python": "3.6"
-      },
       {
         "env": "BUILD=test DAV_SERVER=radicale REQUIREMENTS=release ",
         "python": "3.6"

scripts/make_travisconf.py

@@ -39,8 +39,11 @@
 })
 
 
-for python, requirements in itertools.product(python_versions,
-                                              ("devel", "release", "minimal")):
+for python, requirements in itertools.product(
+    python_versions,
+    # XXX: Use `devel` here for recent python versions:
+    ("release", "minimal")
+):
     dav_servers = ("radicale", "xandikos")
 
     if python == latest_python and requirements == "release":