Add IO::MiddleMan to the Ecosystem

IO::MiddleMan - hijack, capture, or mute writes to an IO::Handle - https://github.com/zoffixznet/perl6-IO-MiddleMan

Author: zoffixznet

META.list

@@ -510,3 +510,4 @@ https://raw.githubusercontent.com/goneri/p6-Email-Notmuch/master/META.info
 https://raw.githubusercontent.com/jnthn/p6-concurrent-iterator/master/META.info
 https://raw.githubusercontent.com/ugexe/zef/master/META6.json
 https://raw.githubusercontent.com/hoelzro/p6-pod-eod/master/META.info
+https://raw.githubusercontent.com/zoffixznet/perl6-IO-MiddleMan/master/META.info