Replace Mix dependency :poison by :jason

lib/exmoji.ex

@@ -20,7 +20,7 @@ defmodule Exmoji do
   @external_resource vendor_data_file
 
   rawfile = File.read! vendor_data_file
-  rawdata = Poison.decode! rawfile, keys: :atoms
+  rawdata = Jason.decode! rawfile, keys: :atoms
   emoji_chars = for char <- rawdata do
     %EmojiChar{
       name:         char.name,
@@ -197,7 +197,7 @@ defmodule Exmoji do
   # produce a string representation of the integer value of a codepoint, in hex
   # this should be zero-padded to a minimum of 4 digits
   defp padded_hex_string(<< cp_int_value :: utf8 >>) do
-    cp_int_value |> Integer.to_string(16) |> String.rjust(4,?0)
+    cp_int_value |> Integer.to_string(16) |> String.pad_leading(4, "0")
   end
 
 

mix.exs

@@ -45,7 +45,7 @@ defmodule Exmoji.Mixfile do
   # Type `mix help deps` for more examples and options
   defp deps do
     [
-      {:poison,       "~> 3.0"},
+      {:jason,        "~> 1.2"},
       {:excoveralls,  "~> 0.6",                 only: :dev},
       {:benchfella,   "~> 0.3",                 only: :dev},
       {:earmark,      "~> 1.1",                 only: :dev},