Use Visual Studio 2017 image on appveyor

support/appveyor-build.py

@@ -20,8 +20,8 @@ if build == 'mingw':
 else:
     # Add MSBuild 14.0 to PATH as described in
     # http://help.appveyor.com/discussions/problems/2229-v140-not-found-on-vs2105rc.
-    os.environ['PATH'] = r'C:\Program Files (x86)\MSBuild\14.0\Bin;' + path
-    generator = 'Visual Studio 14 2015'
+    os.environ['PATH'] = r'C:\Program Files (x86)\MSBuild\15.0\Bin;' + path
+    generator = 'Visual Studio 15 2017'
     if platform == 'x64':
         generator += ' Win64'
     cmake_command.append('-G' + generator)

support/appveyor.yml

@@ -2,6 +2,8 @@ configuration:
   - Debug
   - Release
 
+image: Visual Studio 2017
+
 environment:
   CTEST_OUTPUT_ON_FAILURE: 1
   matrix: