Bump version to 0.3.0

Author: mickel8

README.md

@@ -27,7 +27,7 @@ as WebRTC multiplexes traffic on a single socket but PRs are welcomed
 ```elixir
 def deps do
   [
-    {:ex_ice, "~> 0.2.0"}
+    {:ex_ice, "~> 0.3.0"}
   ]
 end
 ```

mix.exs

@@ -1,13 +1,13 @@
 defmodule ExICE.MixProject do
   use Mix.Project
 
-  @version "0.2.0"
+  @version "0.3.0"
   @source_url "https://github.com/elixir-webrtc/ex_ice"
 
   def project do
     [
       app: :ex_ice,
-      version: "0.2.0",
+      version: @version,
       elixir: "~> 1.13",
       start_permanent: Mix.env() == :prod,
       description: "Implementation of trickle ICE protocol",