Add travis testing for Lua 5.3

rockspecs/argparse-scm-1.rockspec

@@ -1,21 +0,0 @@
-package = "argparse"
-version = "scm-1"
-source = {
-   url = "git://github.com/mpeterv/argparse.git"
-}
-description = {
-   summary = "A feature-rich command-line argument parser",
-   detailed = "argparse supports positional arguments, options, flags, optional arguments, subcommands and more. argparse automatically generates usage, help and error messages. ",
-   homepage = "https://github.com/mpeterv/argparse",
-   license = "MIT/X11"
-}
-dependencies = {
-   "lua >= 5.1, < 5.4"
-}
-build = {
-   type = "builtin",
-   modules = {
-      argparse = "src/argparse.lua"
-   },
-   copy_directories = {"doc", "spec"}
-}