fixes examples in readme.

Author: mb0

README.md

@@ -8,7 +8,7 @@ The algorithm is described by Eugene Myers in
 
 Example
 -------
-You can use diff.Ints, diff.Runes, diff.Strings, and diff.Bytes
+You can use diff.Ints, diff.Runes, diff.ByteStrings, and diff.Bytes
 
     diff.Runes([]rune("sögen"), []rune("mögen")) // returns []Changes{{0,0,1,1}}
 
@@ -29,6 +29,6 @@ and call
 
 Also has granularity functions to merge changes that are close by.
 
-    diff.GranularStrings("emtire", "umpire", 1) // returns []Changes{{0,0,3,3}}
+    diff.Granular(1, diff.ByteStrings("emtire", "umpire")) // returns []Changes{{0,0,3,3}}
 
 Documentation at http://godoc.org/github.com/mb0/diff