Open biomes.csv properly

and add `flowers` in depends.txt
(fixes unknown biome errors)

depends.txt

@@ -1 +1,2 @@
 default
+flowers

init.lua

@@ -19,7 +19,8 @@ minetest.register_node("biomes:mud", {
 	sounds = default.node_sound_dirt_defaults(),
 })
 
-for line in io.lines(path .. "/biomes.csv") do
+local file = io.open(path .. "/biomes.csv", "r")
+for line in file:lines() do
 	local attribs = line:split(",", true)
 	local name, stone, fill, top, dust, sea, river, ymin, ymax, heat, humidity = unpack(attribs)
 
@@ -68,6 +69,8 @@ for line in io.lines(path .. "/biomes.csv") do
 	end
 end
 
+file:close()
+
 --dofile(path .. "/main_biomes.lua")
 --dofile(path .. "/beach_biomes.lua")
 --dofile(path .. "/sea_biomes.lua")