Make as much of a class final as possible

jspahrsummers · jspahrsummers · commit cf22f6b1865c · 2014-08-26T13:02:14.000-07:00
diff --git a/README.md b/README.md
@@ -124,3 +124,5 @@ extension History {
 ```
 
 _Rationale:_ This makes the capturing semantics of `self` stand out more in closures, and avoids verbosity elsewhere.
+
+#### Make as much of a class `final` as possible
