Update

TODO:

Update tutorials and API.md

Co-Authored-By: Pietro Monticone <38562595+pitmonticone@users.noreply.github.com>
Co-Authored-By: Claudio Moroni <43729990+ClaudMor@users.noreply.github.com>

Author: 3 people

src/MultilayerGraphs.jl

@@ -97,6 +97,9 @@ export
     interlayer_valgraph,
     interlayer_simpledigraph,
     interlayer_simpleweighteddigraph,
+    interlayer_metadigraph,
+    interlayer_valoutdigraph,
+    interlayer_valdigraph,
     multiplex_interlayer,
     empty_interlayer,
     is_multiplex_interlayer,