[ruby/psych] Drop to support fat gem support.
ref. https://github.com/ruby/bigdecimal/pull/149
https://github.com/ruby/psych/commit/25ae263252
Added by hsbt (Hiroshi SHIBATA) over 6 years ago
[ruby/psych] Drop to support fat gem support.
ref. https://github.com/ruby/bigdecimal/pull/149
https://github.com/ruby/psych/commit/25ae263252