Update README.md

README.md

@@ -61,7 +61,6 @@ Todo:
   -	Error object (15.11)
   -	Object constructor (15.2.3)
   -	Object prototype (15.2.4)
-  -	Function object (15.3)
-  -	String object (15.5.4 & 15.5.5) _work in progress_
+  -	String object (15.5.4) _work in progress_