Allow fetching of dist-tags by anonymous users

Author: zkochan

lib/dist-tags/fetch.js

@@ -17,10 +17,6 @@ function fetch (uri, params, cb) {
     typeof params.package === 'string',
     'must pass package name to distTags.fetch'
   )
-  assert(
-    params.auth && typeof params.auth === 'object',
-    'must pass auth to distTags.fetch'
-  )
 
   var p = npa(params.package)
   var pkg = p.scope ? params.package.replace('/', '%2f') : params.package