Merge branch 'PHP-7.1' into PHP-7.2

* PHP-7.1:
  Update binary SDK version for AppVeyor

diff --cc .appveyor.yml
index 52dced5f0bcf89877b9b0cd47ad785a3094fa6c3,df91b16711453af1edda3450f9d4ba825afe0f26..3f71aec9f6f1ac95eb2013b33dc31602ecacb875
--- 1/.appveyor.yml
--- 2/.appveyor.yml
+++ b/.appveyor.yml
@@@ -17,8 -17,7 +17,8 @@@ environment
          PHP_BUILD_CACHE_BASE_DIR: c:\build-cache  
          PHP_BUILD_OBJ_DIR: c:\obj
          PHP_BUILD_CACHE_SDK_DIR: c:\build-cache\sdk
-         PHP_BUILD_SDK_BRANCH: php-sdk-2.1.7
+         PHP_BUILD_SDK_BRANCH: php-sdk-2.1.8
 +        PHP_BUILD_CRT: vc15
          # ext and env setup for tests
          #MYSQL_TEST_PASSWD: Password12!
          #MYSQL_TEST_USER: root