Fix do_start typespec (#39)

Author: Noarkhh

README.md

@@ -18,7 +18,7 @@ of dependencies in `mix.exs`:
 ```elixir
 def deps do
   [
-    {:membrane_rtsp, "~> 0.7.0"}
+    {:membrane_rtsp, "~> 0.7.1"}
   ]
 end
 ```

lib/membrane_rtsp/rtsp.ex

@@ -220,7 +220,7 @@ defmodule Membrane.RTSP do
     TCPSocket.close(state.socket)
   end
 
-  @spec do_start(URI.t(), options(), (module(), any() -> GenServer.on_start())) ::
+  @spec do_start(binary() | URI.t(), options(), (module(), any() -> GenServer.on_start())) ::
           GenServer.on_start()
   defp do_start(url, options, start_fun) do
     case URI.parse(url) do

mix.exs

@@ -1,7 +1,7 @@
 defmodule Membrane.RTSP.MixProject do
   use Mix.Project
 
-  @version "0.7.0"
+  @version "0.7.1"
   @github_url "https://github.com/membraneframework/membrane_rtsp"
 
   def project do