added mulch and fertiliser items as well as new strength variable

README.md

@@ -1,11 +1,16 @@
 Bonemeal mod [bonemeal]
 
-This mod adds two new items into the game, bones which can be dug from normal
-dirt and bonemeal which is crafted from bones and player bone blocks.
+This mod adds four new items into the game, bones which can be dug from normal
+dirt which can be made into bonemeal, mulch which is is crafted using a tree and
+8x leaves, and fertiliser which is a mixture of them both.
 
-Bonemeal can be used on added saplings for a 1 in 2 chance to grow them quickly
-as well as specified crops which are grown 1 to 4 steps at a time.  Dirt can
-also be clicked for random grass, flowers or registered decoration to appear.
+Each item can be used on saplings and crops for a chance to grow them quicker as
+well as dirt which will generate random grass, flowers or whichever decoration
+is registered.
+
+Mulch has a strength of 1, Bonemeal 2 and Fertiliser 3 which means the stronger
+the item, the more chance of growing saplings in low light, making crops sprout
+quicker or simply decorate a larger area with grass and flowers.
 
 The api.txt document shows how to add your own saplings, crops and grasses to
 the list by using one of the 3 commands included and the mod.lua file gives you
@@ -17,3 +22,4 @@ Changelog:
 
 - 0.1 - Initial release
 - 0.2 - Added global on_use function for bonemeal growth
+- 0.3 - Added strength to on_use global for new items (mulch and fertiliser).