Add amendments section to note change.

Stebalien · Stebalien · commit 2025389e1084 · 2016-01-15T21:50:12.000-05:00
At @nikomatsakis request.
diff --git a/text/1192-inclusive-ranges.md b/text/1192-inclusive-ranges.md
@@ -108,3 +108,8 @@ The `Empty` variant could be omitted, leaving two options:
 # Unresolved questions
 
 None so far.
+
+# Amendments
+
+* In rust-lang/rfcs#1320, this RFC was amended to change the `RangeInclusive`
+  type from a struct with a `finished` field to an enum.
