windows CI 7.4

.appveyor.yml

@@ -135,6 +135,30 @@ environment:
       PHP_VER: 7.3.0
       ZLIB_VER: 1.2.11
       TS: 1
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      ARCH: x64
+      VC: vc15
+      PHP_VER: 7.4.0
+      ZLIB_VER: 1.2.11
+      TS: 0
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      ARCH: x64
+      VC: vc15
+      PHP_VER: 7.4.0
+      ZLIB_VER: 1.2.11
+      TS: 1
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      ARCH: x86
+      VC: vc15
+      PHP_VER: 7.4.0
+      ZLIB_VER: 1.2.11
+      TS: 0
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      ARCH: x86
+      VC: vc15
+      PHP_VER: 7.4.0
+      ZLIB_VER: 1.2.11
+      TS: 1
 
 build_script:
   ps: |