Remove blacklist code

modules/middleware/checkBlacklist.js

@@ -1,23 +0,0 @@
-import { includesPackage } from '../utils/blacklist';
-
-export default function checkBlacklist(req, res, next) {
-  includesPackage(req.packageName).then(
-    blacklisted => {
-      // Disallow packages that have been blacklisted.
-      if (blacklisted) {
-        res
-          .status(403)
-          .type('text')
-          .send(`Package "${req.packageName}" is blacklisted`);
-      } else {
-        next();
-      }
-    },
-    error => {
-      console.error('Unable to fetch the blacklist: %s', error);
-
-      // Continue anyway.
-      next();
-    }
-  );
-}