Use pend instead of skip

Author: hsbt

test/psych/test_hash.rb

@@ -114,7 +114,7 @@ def test_ref_append
 
     def test_key_deduplication
       unless String.method_defined?(:-@) && (-("a" * 20)).equal?((-("a" * 20)))
-        skip "This Ruby implementation doesn't support string deduplication"
+        pend "This Ruby implementation doesn't support string deduplication"
       end
 
       hashes = Psych.load(<<-eoyml)

test/psych/test_psych.rb

@@ -214,7 +214,7 @@ def test_load_freeze
 
   def test_load_freeze_deduplication
     unless String.method_defined?(:-@) && (-("a" * 20)).equal?((-("a" * 20)))
-      skip "This Ruby implementation doesn't support string deduplication"
+      pend "This Ruby implementation doesn't support string deduplication"
     end
 
     data = Psych.load("--- ['a']", freeze: true)