upgrade wp-config-transformer dep

Author: pwtyler

composer.json

@@ -18,7 +18,7 @@
     ],
     "require": {
         "wp-cli/wp-cli": "^2.5",
-        "wp-cli/wp-config-transformer": "^1.2.1"
+        "wp-cli/wp-config-transformer": "^1.4.0"
     },
     "require-dev": {
         "wp-cli/db-command": "^1.3 || ^2",