MESH.rb in mesh-medical-subject-headings-2.3.0

- old
+ new

@@ -1,5 +1,6 @@
 require 'json'
+require 'set'
 require 'zlib'
 require 'MESH/version'
 require 'MESH/tree'
 require 'MESH/heading'
 require 'MESH/translator'