Upgrading server dependancies (#6431)

vendor/github.com/sean-/seed/README.md

@@ -0,0 +1,44 @@
+# `seed` - Quickly Seed Go's Random Number Generator
+
+Boiler-plate to securely [seed](https://en.wikipedia.org/wiki/Random_seed) Go's
+random number generator (if possible).  This library isn't anything fancy, it's
+just a canonical way of seeding Go's random number generator. Cribbed from
+[`Nomad`](https://github.com/hashicorp/nomad/commit/f89a993ec6b91636a3384dd568898245fbc273a1)
+before it was moved into
+[`Consul`](https://github.com/hashicorp/consul/commit/d695bcaae6e31ee307c11fdf55bb0bf46ea9fcf4)
+and made into a helper function, and now further modularized to be a super
+lightweight and reusable library.
+
+Time is better than
+[Go's default seed of `1`](https://golang.org/pkg/math/rand/#Seed), but friends
+don't let friends use time as a seed to a random number generator.  Use
+`seed.MustInit()` instead.
+
+`seed.Init()` is an idempotent and reentrant call that will return an error if
+it can't seed the value the first time it is called.  `Init()` is reentrant.
+
+`seed.MustInit()` is idempotent and reentrant call that will `panic()` if it
+can't seed the value the first time it is called.  `MustInit()` is reentrant.
+
+## Usage
+
+```
+package mypackage
+
+import (
+  "github.com/sean-/seed"
+)
+
+// MustInit will panic() if it is unable to set a high-entropy random seed:
+func init() {
+  seed.MustInit()
+}
+
+// Or if you want to not panic() and can actually handle this error:
+func init() {
+  if secure, err := !seed.Init(); !secure {
+    // Handle the error
+    //panic(fmt.Sprintf("Unable to securely seed Go's RNG: %v", err))
+  }
+}
+```