!build updated appveyor yml

appveyor.yml

@@ -1,23 +1,18 @@
+image: 
+  - Ubuntu
+  - Visual Studio 2015
+  - Visual Studio 2017
+
 environment:
   APPVEYOR_YML_DISABLE_PS_LINUX: true
   NuGetApiKey:
     secure: Ocp1ATd6eZ0eY9+LfZ9Stp9/J1B5eFdBPMdaTRWVa4xh6/NV45ZBYtU5+eemrTWt
   Coveralls:
     secure: r4c1f5ysoobhV4DGF9zc18yl+buyh7LoV7kRr7aUFvrcjd7VFmj71EPN0Egs9gOQ
   matrix:
-    - image: Ubuntu
-
-    - image: Visual Studio 2015
-      environment: 
-        PYTHON: "C:\\Python27"
-        PYTHON_VERSION: "2.7.8"
-        PYTHON_ARCH: "32"
-
-    - image: Visual Studio 2017
-      environment: 
-        PYTHON: "C:\\Python27"
-        PYTHON_VERSION: "2.7.8"
-        PYTHON_ARCH: "32"
+    - PYTHON: "C:\\Python27"
+      PYTHON_VERSION: "2.7.8"
+      PYTHON_ARCH: "32"
 
 matrix:
   fast_finish: true