web_push.rb in web-push-3.0.1

- old
+ new

@@ -1,9 +1,8 @@
 # frozen_string_literal: true
 
 require 'openssl'
 require 'base64'
-require 'hkdf'
 require 'jwt'
 require 'uri'
 require 'net/http'
 require 'json'
 