Add HTTP::MultiPartParser

Author: tokuhirom

META.list

@@ -372,3 +372,4 @@ https://raw.githubusercontent.com/tony-o/perl6-green/master/META.info
 https://raw.githubusercontent.com/shoichikaji/mi6/master/META.info
 https://raw.githubusercontent.com/tokuhirom/p6-Raw-Socket/master/META.info
 https://raw.githubusercontent.com/carbin/p6-unix-privileges/master/META.info
+https://raw.githubusercontent.com/tokuhirom/p6-HTTP-MultiPartParser/master/META6.json