refactor: don’t warn if no versions found

lib/workers/repository/process/lookup/index.js

@@ -60,15 +60,8 @@ async function lookupUpdates(config) {
       .filter(v => isVersion(v));
     // istanbul ignore if
     if (allVersions.length === 0) {
-      const message = `No versions returned from registry for this package`;
-      logger.warn({ dependency: depName, result: dependency }, message);
-      // TODO: return an object
-      res.updates.push([
-        {
-          updateType: 'warning',
-          message,
-        },
-      ]);
+      const message = `No valid versions returned from registry for this package`;
+      logger.info({ dependency: depName, result: dependency }, message);
       return res;
     }
     // Check that existing constraint can be satisfied