Recording converter fixes (#3)

* Recorder fixes

* Review fixes

* Bump ex_webrtc to 0.14. Release 0.3

Author: sgfn

.formatter.exs

@@ -1,4 +1,5 @@
 # Used by "mix format"
 [
-  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"],
+  import_deps: [:membrane_core]
 ]

README.md

@@ -12,7 +12,7 @@ Add `:ex_webrtc_recorder` to your list of dependencies
 ```elixir
 def deps do
   [
-    {:ex_webrtc_recorder, "~> 0.2.1"}
+    {:ex_webrtc_recorder, "~> 0.3.0"}
   ]
 end
 ```
@@ -28,7 +28,7 @@ but it must be explicitly turned on by adding the following dependencies:
 ```elixir
 def deps do
   [
-    {:ex_webrtc_recorder, "~> 0.2.1"},
+    {:ex_webrtc_recorder, "~> 0.3.0"},
     {:ex_aws_s3, "~> 2.5"},
     {:ex_aws, "~> 2.5"},
     {:sweet_xml, "~> 0.7"},