update readme.md

readme.MD

@@ -12,6 +12,8 @@ The regrow.add_fruit() function is used to override each fruits after_dig_node
 function so that an invisible node is placed once it is taken, then a timer is
 started that will regrow the fruit on completion (unless tree is chopped down).
 
+Example: regrow.add_fruit("default:apple", "default:leaves")
+
 So far default apples and ethereal banana, orange and coconuts are supported.
 
 
@@ -21,3 +23,4 @@ Changelog
  - 0.1 - Initial upload.
  - 0.2 - Add checks for player placed fruit and tree's nearby.
  - 0.3 - Make add_fruit a global function for other mods to use.
+ - 0.4 - Add check for fruit tree leaf type before re-growing.