Use mod.conf for dependencies and description

depends.txt

@@ -1,2 +0,0 @@
-default?
-fire?

description.txt

@@ -1 +0,0 @@
-A mod that adds thunder and lightning effects.

init.lua

@@ -61,7 +61,7 @@ local function choose_pos(pos)
 
 		local r = rng:next(1, playercount)
 		local randomplayer = playerlist[r]
-		pos = randomplayer:getpos()
+		pos = randomplayer:get_pos()
 
 		-- avoid striking underground
 		if pos.y < -20 then
@@ -226,4 +226,4 @@ minetest.after(5, function()
 		minetest.after(rng:next(lightning.interval_low,
 			lightning.interval_high), lightning.strike)
 	end
-end)
+end)

mod.conf

@@ -1 +1,3 @@
 name = lightning
+optional_depends = default, fire
+description = A mod that adds thunder and lightning effects.