Merge branch 'v1.8'

* v1.8:
  Use stable phpunit-bridge version

Author: alcaeus

composer.json

@@ -18,7 +18,7 @@
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "^3.5, <3.5.5",
-        "symfony/phpunit-bridge": "5.x-dev"
+        "symfony/phpunit-bridge": "^5.2"
     },
     "autoload": {
         "psr-4": { "MongoDB\\": "src/" },