Bump elixir version.

.travis.yml

@@ -1,5 +1,7 @@
 language: elixir
-elixir:
+matrix:
-  - 1.2.2
+  include:
-otp_release:
+    - elixir: 1.2.2
-  - 18.2.1
+      otp_release: 18.2.1
+    - elixir: 1.3.4
+      otp_release: 19.1

mix.exs

@@ -4,7 +4,7 @@ defmodule Koans.Mixfile do
   def project do
     [app: :elixir_koans,
      version: "0.0.1",
-     elixir: ">= 1.2.1",
+     elixir: ">= 1.2.1 and < 1.4.0",
      elixirc_paths: elixirc_path(Mix.env),
      deps: deps]
   end