Update appveyor config

Author: TysonAndre

.travis.yml

@@ -3,7 +3,6 @@ language: php
 php:
   - 7.2
   - 7.1
-  - 7.0
 
 cache:
   directories:

appveyor.yml

@@ -1,5 +1,4 @@
 # Based on igbinary and php-ast's appveyor config.
-# This tests against the latest stable minor version of PHP 7 (Currently 7.1)
 # The project name is the same as the build id used, e.g. https://www.appveyor.com/docs/environment-variables/
 
 version: '{branch}.{build}'
@@ -25,19 +24,24 @@ build_script:
 
     cd C:\projects\php
 
-    appveyor DownloadFile http://windows.php.net/downloads/releases/archives/php-7.1.9-nts-Win32-VC14-x86.zip
+    SET PHP_ZIP_BASENAME=php-7.1.33-nts-Win32-VC14-x86.zip
 
-    7z x -y php-7.1.9-nts-Win32-VC14-x86.zip
+    SET PHP_AST_VERSION=0.1.6
+    SET AST_ZIP_BASENAME=php_ast-%PHP_AST_VERSION%-7.1-nts-vc14-x86.zip
+
+    curl -fsS https://windows.php.net/downloads/releases/archives/%PHP_ZIP_BASENAME% -o %PHP_ZIP_BASENAME% || curl -fsS https://windows.php.net/downloads/releases/%PHP_ZIP_BASENAME% -o %PHP_ZIP_BASENAME%
+
+    7z x -y %PHP_ZIP_BASENAME
 
     del /Q *.zip
 
     cd C:\projects\php\ext
 
     git clone --depth=1 --branch=master https://github.com/nikic/php-ast C:\projects\php-src\ext\ast
 
-    appveyor DownloadFile http://windows.php.net/downloads/pecl/releases/ast/0.1.6/php_ast-0.1.6-7.1-nts-vc14-x86.zip
+    curl -fsS https://windows.php.net/downloads/pecl/releases/ast/%PHP_AST_VERSION%/%AST_ZIP_BASENAME% -o %AST_ZIP_BASENAME%
 
-    7z x php_ast-0.1.6-7.1-nts-vc14-x86.zip php_ast.dll -y >nul
+    7z x %AST_ZIP_BASENAME% php_ast.dll -y >nul
 
     cd C:\projects\php