Bump version

Author: michalmuskala

README.md

@@ -19,7 +19,7 @@ in `mix.exs`:
 
 ```elixir
 def deps do
-  [{:jason, "~> 1.1"}]
+  [{:jason, "~> 1.2"}]
 end
 ```
 

mix.exs

@@ -1,7 +1,7 @@
 defmodule Jason.Mixfile do
   use Mix.Project
 
-  @version "1.1.2"
+  @version "1.2.0"
 
   def project() do
     [