Merge pull request #1239 from ddunn2/nsdictionaryValue

diff --git a/Foundation/NSDictionary.swift b/Foundation/NSDictionary.swift
index 8aa981f..d3d8d54 100644
--- a/Foundation/NSDictionary.swift
+++ b/Foundation/NSDictionary.swift
@@ -32,6 +32,10 @@
         return nil
     }
     
+    open func value(forKey key: String) -> Any? {
+        NSUnsupported()
+    }
+    
     open func keyEnumerator() -> NSEnumerator {
         guard type(of: self) === NSDictionary.self || type(of: self) === NSMutableDictionary.self else {
             NSRequiresConcreteImplementation()