Gemfile in x25519-1.0.4 vs Gemfile in x25519-1.0.5

- old
+ new

@@ -6,7 +6,7 @@
 
 group :development, :test do
   gem "rake", require: false
   gem "rake-compiler", "~> 1.0", require: false
   gem "rspec", "~> 3.7", require: false
-  gem "rubocop", "0.51.0", require: false
+  gem "rubocop", "0.52.1", require: false
 end