Merge pull request #762 from kares/bump-snakeyaml-2.10

bump snakeyaml-engine to 2.10 (jruby)

Author: headius

lib/psych/versions.rb

@@ -5,6 +5,6 @@ module Psych
   VERSION = '5.3.0'
 
   if RUBY_ENGINE == 'jruby'
-    DEFAULT_SNAKEYAML_VERSION = '2.9'.freeze
+    DEFAULT_SNAKEYAML_VERSION = '2.10'.freeze
   end
 end