Remove ugly whitespace from code blocks

README.md

@@ -20,7 +20,6 @@ audio_output {
     format      "48000:16:2"
     mixer_type  "software"
 }
-
 ```
 
 Then start the bot:
@@ -32,6 +31,5 @@ Then start the bot:
 For additional options:
 ```
 ./mumble-bot-rs --help
-
 ```