update rockspec, remove 5.4 limitation

date-2.1.2-3.rockspec

@@ -0,0 +1,30 @@
+package = "date"
+version = "2.1.2-3"
+
+description = {
+   summary = "Date & Time module for Lua 5.x",
+   detailed = [[
+      Pure Lua Date & Time module for Lua 5.x featuring date and time string
+      parsing, time addition & subtraction, time span calculation, support for
+      ISO 8601 dates, local time support, strftime-like formatting.
+   ]],
+   license = "MIT",
+   homepage = "https://github.com/Tieske/date",
+}
+
+dependencies = {
+   "lua >= 5.0, < 5.5"
+}
+
+source = {
+   url = "https://github.com/Tieske/date/archive/version_2.1.2.tar.gz",
+   dir = "date-version_2.1.2",
+}
+
+build = {
+   type = "builtin",
+   modules = {
+      date = "src/date.lua"
+   }
+}
+