Switched the builder image

appveyor.yml

@@ -18,16 +18,6 @@ environment:
     PYTHON: c:\Python36
     # For details about Appveyor build worker images (VM template): https://www.appveyor.com/docs/build-environment/#build-worker-images
     matrix:
-      - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-        BUILD_PLATFORM: x86
-        TEST_PHP_SQL_SERVER: (local)\SQL2012SP1
-        SQL_INSTANCE: SQL2012SP1
-        PHP_VC: 14
-        PHP_MAJOR_VER: 7.1
-        PHP_MINOR_VER: latest
-        PHP_EXE_PATH: Release
-        THREAD: nts
-        platform: x86
       - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
         BUILD_PLATFORM: x64
         TEST_PHP_SQL_SERVER: (local)\SQL2016
@@ -38,6 +28,16 @@ environment:
         PHP_EXE_PATH: x64\Release_TS
         THREAD: ts
         platform: x64
+      - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+        BUILD_PLATFORM: x86
+        TEST_PHP_SQL_SERVER: (local)\SQL2012SP1
+        SQL_INSTANCE: SQL2012SP1
+        PHP_VC: 14
+        PHP_MAJOR_VER: 7.1
+        PHP_MINOR_VER: latest
+        PHP_EXE_PATH: Release
+        THREAD: nts
+        platform: x86
 
 # PHP_MAJOR_VER is PHP major version to build (7.2, 7.1)
 # PHP_MINOR_VER is PHP point release number (or latest for latest release)