HISTORY.md in signed_multiset-0.1.0 vs HISTORY.md in signed_multiset-0.2.0

@@ -1,4 +1,9 @@
+# 0.2.0
+- Remove the SignedMultiset folder namespace.
+- Replace SignedMultiset[] with SignedMultiset()
+- SignedMultiset() and SignedMultiset.new() both take arrays, hashes, or argument lists as arguments.
+
 # 0.1.0
 - Fix return values when setting mutliplicity.
 
 # 0.0.2
 - New #delete method