Update .travis.yml

Add PHP72 Test

.travis.yml

@@ -10,16 +10,19 @@ env:
     - PHP_VERSION=56 BUILD_SERVICE=workspace
     - PHP_VERSION=70 BUILD_SERVICE=workspace
     - PHP_VERSION=71 BUILD_SERVICE=workspace
+    - PHP_VERSION=72 BUILD_SERVICE=workspace
 
     - PHP_VERSION=56 BUILD_SERVICE=php-fpm
     - PHP_VERSION=70 BUILD_SERVICE=php-fpm
     - PHP_VERSION=71 BUILD_SERVICE=php-fpm
+    - PHP_VERSION=72 BUILD_SERVICE=php-fpm
 
     - PHP_VERSION=hhvm BUILD_SERVICE=hhvm
 
     # - PHP_VERSION=56 BUILD_SERVICE=php-worker
     - PHP_VERSION=70 BUILD_SERVICE=php-worker
     - PHP_VERSION=71 BUILD_SERVICE=php-worker
+    - PHP_VERSION=72 BUILD_SERVICE=php-worker
 
     - PHP_VERSION=56 BUILD_SERVICE=mssql
     - PHP_VERSION=70 BUILD_SERVICE=mssql