Add missing dev dependency

swissspidy · swissspidy · commit 29c667a5a44a · 2018-08-04T16:40:13.000+02:00
diff --git a/composer.json b/composer.json
@@ -15,6 +15,7 @@
         "wp-cli/wp-cli": "^2"
     },
     "require-dev": {
+        "wp-cli/extension-command": "^1.2",
         "wp-cli/wp-cli-tests": "^0"
     },
     "config": {
