message: chore(dependencies): update to want 0.3
diff: @@ -44,7 +44,7 @@ tokio-io = "0.2.0-alpha.2"
  tokio-sync = "0.2.0-alpha.2"
  tokio-net = { version = "0.2.0-alpha.2", optional = true, features = ["tcp"] }
  tokio-timer = { version = "0.3.0-alpha.2", optional = true }
  -want = { git = "https://github.com/seanmonstar/want", branch = "std-future" }
  +want = "0.3"
  [dev-dependencies]
  matches = "0.1"
  