Update 2.2

CHANGELOG

@@ -1,3 +1,7 @@
+Version 2.2:
+- "Hit detection" based on spearhead position
+- Spears go through buildable_to nodes (snow)
+- Ugly fix to not collide in air above slabs (works only if slabs are not rotated)
 
 Version 2.1:
 - Spears ding hard blocks (cracky < 3)
@@ -17,4 +21,4 @@ Version 2.0:
 - New gold-plated spear to celebrate
 
 Version 1.1:
-- Make use of new on_secondary_use API, requires Minetest 5.2.0
+- Make use of new on_secondary_use API, requires Minetest 5.2.0