Add .opus extension for audio/ogg mimetype, per RFC 7845
RFC 7845:
Submitted by: Richard de Boer <richard tubul.net>
Github: closes
@@ -1439,7 +1439,7 @@ audio/mp4 m4a mp4a
audio/mpeg mpga mp2 mp2a mp3 m2a m3a
# audio/mpeg4-generic
# audio/musepack
-audio/ogg oga ogg spx
+audio/ogg oga ogg spx opus
# audio/opus
# audio/parityfec
# audio/pcma
