Merge branch 'PHP-7.1' into PHP-7.2

* PHP-7.1:
  Update binary SDK version for AppVeyor

diff --cc .appveyor.yml
index 3f71aec9f6f1ac95eb2013b33dc31602ecacb875,7630dc3ad22750ea099f6ad164f7d89cbb46b230..085389f638ca52eb01473c4cb702d62960384e15
--- 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-2.1.8
+         PHP_BUILD_SDK_BRANCH: php-sdk-2.1.9beta1
 +        PHP_BUILD_CRT: vc15
          # ext and env setup for tests
          #MYSQL_TEST_PASSWD: Password12!
          #MYSQL_TEST_USER: root