Add Stream::Buffered

Author: moznion

META.list

@@ -398,3 +398,4 @@ https://raw.githubusercontent.com/eiro/p6-Rototo/master/META.info
 https://raw.githubusercontent.com/mattn/p6-Path-Canonical/master/META6.json
 https://raw.githubusercontent.com/awwaiid/p6-lrep/master/META.info
 https://raw.githubusercontent.com/lestrrat/p6-Apache-LogFormat/master/META6.json
+https://raw.githubusercontent.com/moznion/p6-Stream-Buffered/master/META6.json