Merge pull request #160 from wp-cli/no-lock-file

Author: swissspidy

composer.json

@@ -26,7 +26,8 @@
         "allow-plugins": {
             "dealerdirect/phpcodesniffer-composer-installer": true,
             "johnpbloch/wordpress-core-installer": true
-        }
+        },
+        "lock": false
     },
     "extra": {
         "branch-alias": {