Remove deprecated python versions and add new ones

Author: thomasrockhu

appveyor.yml

@@ -13,35 +13,37 @@ environment:
     # a later point release.
 
     - PYTHON: "C:\\Python27"
-      PYTHON_VERSION: "2.7.x" # currently 2.7.9
+      PYTHON_VERSION: "2.7.x" # currently 2.7.15
       PYTHON_ARCH: "32"
 
     - PYTHON: "C:\\Python27-x64"
-      PYTHON_VERSION: "2.7.x" # currently 2.7.9
+      PYTHON_VERSION: "2.7.x" # currently 2.7.15
       PYTHON_ARCH: "64"
 
-    - PYTHON: "C:\\Python33"
-      PYTHON_VERSION: "3.3.x" # currently 3.3.5
+    - PYTHON: "C:\\Python34"
+      PYTHON_VERSION: "3.4.x" # currently 3.4.4
       PYTHON_ARCH: "32"
 
-    - PYTHON: "C:\\Python33-x64"
-      PYTHON_VERSION: "3.3.x" # currently 3.3.5
+    - PYTHON: "C:\\Python34-x64"
+      PYTHON_VERSION: "3.4.x" # currently 3.4.4
       PYTHON_ARCH: "64"
 
-    - PYTHON: "C:\\Python34"
-      PYTHON_VERSION: "3.4.x" # currently 3.4.3
+    - PYTHON: "C:\\Python36"
+      PYTHON_VERSION: "3.6.x" # currently 3.6.6
       PYTHON_ARCH: "32"
 
-    - PYTHON: "C:\\Python34-x64"
-      PYTHON_VERSION: "3.4.x" # currently 3.4.3
+    - PYTHON: "C:\\Python36-x64"
+      PYTHON_VERSION: "3.6.x" # currently 3.6.6
       PYTHON_ARCH: "64"
 
-    # Also test Python 2.6.6 not pre-installed
-
-    - PYTHON: "C:\\Python266"
-      PYTHON_VERSION: "2.6.6"
+    - PYTHON: "C:\\Python37"
+      PYTHON_VERSION: "3.7.x" # currently 3.7.1
       PYTHON_ARCH: "32"
 
+    - PYTHON: "C:\\Python37-x64"
+      PYTHON_VERSION: "3.7.x" # currently 3.7.1
+      PYTHON_ARCH: "64"
+
 install:
   # Download the Appveyor Python build accessories into subdirectory .\appveyor
   - mkdir appveyor