Merge pull request #16 from scheidan/patch-1

mention `get_weight` in Readme

Author: gdalle

README.md

@@ -14,6 +14,9 @@ add_edge!(g, 1, 2, 0.5)
 add_edge!(g, 2, 3, 0.8)
 add_edge!(g, 1, 3, 2.0)
 
+# get weight of edge from vertex 1 to vertex 2
+get_weight(g, 1, 2)
+
 # find the shortest path from vertex 1 to vertex 3 taking weights into account.
 enumerate_paths(dijkstra_shortest_paths(g, 1), 3)
 3-element Array{Int64,1}: