fix for python 3 testing which was falling back to python 2

Author: kapilkd13

appveyor.yml

@@ -11,16 +11,16 @@ environment:
       PYTHON_VERSION: "2.7.x"
       PYTHON_ARCH: "64"
 
-    - PYTHON: "C:\\Python33_64"
-      PYTHON_VERSION: "3.3"
+    - PYTHON: "C:\\Python33-x64"
+      PYTHON_VERSION: "3.3.x"
       PYTHON_ARCH: "64"
 
-    - PYTHON: "C:\\Python34_64"
-      PYTHON_VERSION: "3.4"
+    - PYTHON: "C:\\Python34-x64"
+      PYTHON_VERSION: "3.4.x"
       PYTHON_ARCH: "64"
 
-    - PYTHON: "C:\\Python35_64"
-      PYTHON_VERSION: "3.5"
+    - PYTHON: "C:\\Python35-x64"
+      PYTHON_VERSION: "3.5.x"
       PYTHON_ARCH: "64"