Force doctrine/dbal <=2.10.2 when testing

Author: nicolas-grekas

composer.json

@@ -35,7 +35,7 @@
         "symfony/validator": "^3.2.5|~4.0",
         "symfony/translation": "~2.8|~3.0|~4.0",
         "doctrine/data-fixtures": "1.0.*",
-        "doctrine/dbal": "~2.4",
+        "doctrine/dbal": "~2.4,<=2.10.2",
         "doctrine/orm": "^2.4.5"
     },
     "conflict": {