Logger: rename level => levelname to avoid name collision

lib/utils/logger.js

@@ -18,10 +18,10 @@ module.exports = class Logger {
             formatters: {
                 level (label) {
                     if (label === 'warn') {
-                        return { level: 'warning' };
+                        return { levelname: 'warning' };
                     }
 
-                    return { level: label };
+                    return { levelname: label };
                 }
             },
             messageKey: 'message',

package-lock.json

@@ -814,7 +814,7 @@
       "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo="
     },
     "camshaft": {
-      "version": "github:cartodb/camshaft#0d64ad11d61b860682eef2cb2980aa9f8a97fe5f",
+      "version": "github:cartodb/camshaft#85082160a8c936e0521965b095e39349c652e4f5",
       "from": "github:cartodb/camshaft#feature/ch91877/remove-log-aggregation-in-metro",
       "requires": {
         "async": "^1.5.2",