add 3.1.0 rockspec

rockspecs/middleclass-3.1-0.rockspec

@@ -0,0 +1,21 @@
+package = "middleclass"
+version = "3.1-0"
+source = {
+  url = "https://github.com/kikito/middleclass/archive/v3.1.0.tar.gz",
+  dir = "middleclass-3.0.0"
+}
+description = {
+   summary = "A simple OOP library for Lua",
+   detailed = "It has inheritance, metamethods (operators), class variables and weak mixin support",
+   homepage = "https://github.com/kikito/middleclass",
+   license = "MIT"
+}
+dependencies = {
+   "lua >= 5.1"
+}
+build = {
+   type = "builtin",
+   modules = {
+      middleclass = "middleclass.lua"
+   }
+}