[graph] export EdgesConnecting publicly

This is part of a public API so it should be public.
diff --git a/src/lib.rs b/src/lib.rs
index d475884..aaaa566 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -163,9 +163,9 @@
 pub mod graph {
     pub use crate::graph_impl::{
         edge_index, node_index, DefaultIx, DiGraph, Edge, EdgeIndex, EdgeIndices, EdgeReference,
-        EdgeReferences, EdgeWeightsMut, Edges, Externals, Frozen, Graph, GraphIndex, IndexType,
-        Neighbors, Node, NodeIndex, NodeIndices, NodeReferences, NodeWeightsMut, UnGraph,
-        WalkNeighbors,
+        EdgeReferences, EdgeWeightsMut, Edges, EdgesConnecting, Externals, Frozen, Graph,
+        GraphIndex, IndexType, Neighbors, Node, NodeIndex, NodeIndices, NodeReferences,
+        NodeWeightsMut, UnGraph, WalkNeighbors,
     };
 }