Travis: do not test Plone 4.0.

It gives an ImportError when using plone.testing 5.

.travis.yml

@@ -11,8 +11,6 @@ env:
 - PLONE_VERSION=5.1 TEST_EGGS=buildout:test-eggs=plone.app.robotframework
 matrix:
   include:
-  - python: 2.6
-    env: PLONE_VERSION=4.0 PARTS=buildout:parts-=code-analysis
   - python: 2.6
     env: PLONE_VERSION=4.1 PARTS=buildout:parts-=code-analysis
   fast_finish: true

README.rst

@@ -94,7 +94,8 @@ Compatibility
 
 I have tried this on Plone 3.3, Plone 4 and Plone 5.
 
-It is automatically tested by Travis on Plone 4.0, 4.1, 4.2, 4.3, 5.0, and 5.1.
+It is automatically tested by Travis on Plone 4.1, 4.2, 4.3, 5.0, and 5.1.
+
 
 Authors
 -------

setup.py

@@ -9,21 +9,18 @@
       long_description=(open("README.rst").read() + "\n" +
                         open("CHANGES.rst").read()),
       # Get more strings from
-      # http://pypi.python.org/pypi?%3Aaction=list_classifiers
+      # https://pypi.python.org/pypi?%3Aaction=list_classifiers
       classifiers=[
           "Framework :: Plone",
-          "Framework :: Plone :: 3.3",
-          "Framework :: Plone :: 4.0",
           "Framework :: Plone :: 4.1",
           "Framework :: Plone :: 4.2",
           "Framework :: Plone :: 4.3",
           "Framework :: Plone :: 5.0",
           "Framework :: Plone :: 5.1",
           "Programming Language :: Python",
-          "Programming Language :: Python :: 2.4",
           "Programming Language :: Python :: 2.6",
           "Programming Language :: Python :: 2.7",
-          ],
+      ],
       keywords='plone catalog cleanup',
       author='Maurits van Rees',
       author_email='m.van.rees@zestsoftware.nl',