Update to elixir v0.12.4 and support v0.13.0-dev

mix.exs

@@ -4,8 +4,9 @@ defmodule Decimal.Mixfile do
   def project do
     [ app: :decimal,
       version: "0.0.1",
-      elixir: "~> 0.12.3",
+      elixir: "~> 0.12.4 or ~> 0.13.0-dev",
       deps: deps(Mix.env),
+      build_per_environment: false,
       name: "Decimal",
       source_url: "https://github.com/ericmj/decimal",
       docs: fn -> [

mix.lock

@@ -1 +1 @@
-[ "ex_doc": {:git, "git://github.com/elixir-lang/ex_doc.git", "aecbe8cf755fc81d76e2924d69a33642b7945af9", []} ]
+[ "ex_doc": {:git, "git://github.com/elixir-lang/ex_doc.git", "1419e7adc1c289cd75587d9f435c412c70c297d9", []} ]

release_docs.exs

@@ -0,0 +1,34 @@
+# Run with mix run release_docs.exs
+
+# Uncommited changes will not be included!
+
+# Files that will be included in addition to the
+# ex_doc generated files
+additional_files = [
+  "README.html"
+]
+
+System.cmd "git stash -u"
+
+Mix.Task.run "docs"
+files = Path.wildcard("docs/**") |> Enum.map(&Path.relative_to(&1, "docs"))
+files = files ++ additional_files
+
+IO.puts System.cmd "git checkout gh-pages"
+
+System.cmd "git reset"
+
+old_files = System.cmd("git ls-files") |> String.split("\n")
+old_files = old_files -- additional_files
+IO.puts System.cmd "git rm " <> Enum.join(old_files, " ")
+
+File.cp_r "docs/.", "./"
+File.rm_rf! "docs"
+
+IO.puts System.cmd "git add " <> Enum.join(files, " ")
+IO.puts System.cmd "git commit -m \"Update docs\""
+IO.puts System.cmd "git push"
+
+Enum.each(files, &File.rm_rf!/1)
+IO.puts System.cmd "git checkout master --force"
+System.cmd "git stash pop"