Maintenance: Remove depends.txt and error on old MT versions

technic/init.lua

@@ -1,7 +1,11 @@
--- Minetest 0.4.7 mod: technic
 -- namespace: technic
 -- (c) 2012-2013 by RealBadAngel <mk@realbadangel.pl>
 
+if not minetest.get_translator then
+	error("[technic] Your Minetest version is no longer supported."
+		.. " (version < 5.0.0)")
+end
+
 local load_start = os.clock()
 
 technic = rawget(_G, "technic") or {}