Merge branch 'PHP-7.1' into PHP-7.2

* PHP-7.1:
  Update SDK version for AppVeyor

diff --cc .appveyor.yml
index eeac1329ce60e28347dc8919c7406116f147a2b0,9bf1a67a3de9d82e7f1416b5e415d126b3a185c2..d50b867e337b0cbd0b5349415ad8a0b8dcf0c081
--- 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-2.1.5
+         PHP_BUILD_SDK_BRANCH: php-sdk-2.1.7beta1
 +        PHP_BUILD_CRT: vc15
          # ext and env setup for tests
          #MYSQL_TEST_PASSWD: Password12!
          #MYSQL_TEST_USER: root