message: Update petgraph to 0.5.0
diff: @@ -26,7 +26,7 @@ regex = "1.0.0"
  [dependencies]
  regex = "1.0.0"
  -petgraph = { git = "https://github.com/petgraph/petgraph", features = ["quickcheck"] }
  +petgraph = { version = "0.5.0", features = ["quickcheck"] }
  serde_json = "1.0.0"
  lazy_static = "1.0.0"
  docopt = "1.0.0"
  