Use vlucas/phpdotenv 3.* in tests

Naktibalda · Naktibalda · commit 693ef9f19d8b · 2019-02-03T17:06:18.000+02:00
Because Codeception was updated to use that version
diff --git a/composer.json b/composer.json
@@ -25,7 +25,7 @@
         }
     },
     "require-dev": {
-        "vlucas/phpdotenv": "^2.4",
+        "vlucas/phpdotenv": "^3.0",
         "codeception/specify": "*"
     }
 }
