Fix retriving ice-lite attribute (#217)

Co-authored-by: adyla <[email protected]>

Author: OctopusRage

lib/ex_webrtc/sdp_utils.ex

@@ -140,7 +140,7 @@ defmodule ExWebRTC.SDPUtils do
   end
 
   @spec get_ice_lite(ExSDP.t()) :: boolean()
-  def get_ice_lite(sdp), do: ExSDP.get_attribute(sdp, "ice-lite") != nil
+  def get_ice_lite(sdp), do: ExSDP.get_attribute(sdp, :ice_lite) != nil
 
   @spec get_ice_credentials(ExSDP.t()) ::
           {:ok, {binary(), binary()} | nil}