Bump version to 0.3.0

Author: mickel8

README.md

@@ -12,7 +12,7 @@ In your `mix.exs`:
 ```elixir
 def deps do
   [
-    {:live_ex_webrtc, "~> 0.2.1"}
+    {:live_ex_webrtc, "~> 0.3.0"}
   ]
 end
 ```

mix.exs

@@ -1,7 +1,7 @@
 defmodule LiveExWebrtc.MixProject do
   use Mix.Project
 
-  @version "0.2.1"
+  @version "0.3.0"
   @source_url "https://github.com/elixir-webrtc/live_ex_webrtc"
 
   def project do