Add Algorithm::LBFGS to ecosystem

See https://github.com/titsuki/p6-Algorithm-LBFGS

Author: titsuki

META.list

@@ -718,3 +718,4 @@ https://raw.githubusercontent.com/jsimonet/IRC-Client-Plugin-UserPoints/master/M
 https://raw.githubusercontent.com/FCO/Heap/master/META.info
 https://raw.githubusercontent.com/ramiroencinas/perl6-FileSystem-Capacity/master/META.info
 https://raw.githubusercontent.com/pierre-vigier/Perl6-Data-MessagePack/master/META6.json
+https://raw.githubusercontent.com/titsuki/p6-Algorithm-LBFGS/master/META6.json