Stop running appveyor tests on Python 3.4; they fail anyway.

appveyor.yml

@@ -15,15 +15,6 @@ environment:
       PYTHON_VERSION: "2.7.x"
       PYTHON_ARCH: "64"
 
-    - PYTHON: "C:\\Python34"
-      PYTHON_VERSION: "3.4.x"
-      PYTHON_ARCH: "32"
-
-    - PYTHON: "C:\\Python34-x64"
-      PYTHON_VERSION: "3.4.x"
-      PYTHON_ARCH: "64"
-      DISTUTILS_USE_SDK: "1"
-
     - PYTHON: "C:\\Python35"
       PYTHON_VERSION: "3.5.x"
       PYTHON_ARCH: "32"