Updating readme.

README.md

@@ -8,19 +8,40 @@ string chunks.
 ```lua
 make_diff = require "diff"
 s1 = [[hello
+...
 to the
 world]]
 s2 = [[hello
+...
 at the
 world]]
 diff = make_diff(s1, s2)
+```
+
+returns the table:
+
+```
+{
+  {old="hello\n...\n", old_line=1, old_line_end=2,
+   new="hello\n...\n", new_line=1, new_line_end=2},
+  {old="to the\n", old_line=3, old_line_end=3,
+   new="at the\n", new_line=3, new_line_end=3},
+  {old="world", old_line=4, old_line_end=4,
+   new="world", new_line=4, new_line_end=4},
+}
+```
+
+and running:
+
+```lua
 diff:print{color=false}
 ```
 
-Produces:
+produces the output:
 
 ```
   hello
+  ...
 - to the
 + at the
   world