update README.md to be copy-able (#13)

sorry for the small PR, but having a code copy-paste error is kind of disturbing.
QuantumBFS · Jan 26, 2023 · 6ec2766 · 6ec2766
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commit 6ec2766
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -25,7 +25,7 @@ pkg> add Multigraphs
 ## Examples
 
 ```julia
-using Graphs, Multigraphs
+julia> using Graphs, Multigraphs
 
 # create a undirected multigraph with 3 vertices and 0 multiple edges
 # use DiMultigraph for directed multigraphs