UPGRADE.md in csv2hash-0.6.3 vs UPGRADE.md in csv2hash-0.6.4

@@ -1,7 +1,13 @@
 # Upgrading
 
+# Upgrading from 0.6.3 to 0.6.4
+
+nothing
+
 # Upgrading from 0.6.2 to 0.6.3
+
+nothing
 
 # Upgrading from 0.6.1 to 0.6.2
 
 nothing