relaton_iho.rb in relaton-iho-1.10.0

- old
+ new

@@ -1,5 +1,6 @@
 require "digest/md5"
+require "yaml"
 require "relaton_bib"
 require "relaton_iho/version"
 require "relaton_iho/iho_bibliography"
 require "relaton_iho/hash_converter"
 require "relaton_iho/xml_parser"