message: chore(lib): update base64 and futures versions
  base64 0.6 -> 0.8
  futures 0.1.14 -> 0.1.17
diff: @@ -19,9 +19,9 @@ include = [
  ]
  [dependencies]
  -base64 = "0.6"
  +base64 = "0.8"
  bytes = "0.4.4"
  -futures = "0.1.14"
  +futures = "0.1.17"
  futures-cpupool = "0.1.6"
  http = { version = "0.1", optional = true }
  httparse = "1.0"
  