Correct style errors identified by the latest version of RuboCop
diff --git a/src/ruby/spec/server_spec.rb b/src/ruby/spec/server_spec.rb
index a47e484..bb566d1 100644
--- a/src/ruby/spec/server_spec.rb
+++ b/src/ruby/spec/server_spec.rb
@@ -152,7 +152,7 @@
     it 'does not take a hash with bad values as channel args' do
       blk = construct_with_args(symbol: Object.new)
       expect(&blk).to raise_error TypeError
-      blk = construct_with_args('1' => Hash.new)
+      blk = construct_with_args('1' => {})
       expect(&blk).to raise_error TypeError
     end