Update all dependencies

vendor/github.com/kjk/betterguid/README.md

@@ -1,4 +1,4 @@
-This is Go package to generate guid (globally unique id) with good properties
+This is Go package to generate guid (globally unique id) with good properties.
 
 Usage:
 ```go
@@ -10,13 +10,13 @@ fmt.Printf("guid: '%s'\n", id)
 
 Generated guids have good properties:
 * they're 20 character strings, safe for inclusion in urls (don't require escaping)
-* they're based on timestamp so that they sort **after** any existing ids
+* they're based on timestamp; they sort **after** any existing ids
 * they contain 72-bits of random data after the timestamp so that IDs won't
-  collide with other clients' IDs
-* they sort **lexicographically** (so the timestamp is converted to characters
-  that will sort properly)
-* they're monotonically increasing.  Even if you generate more than one in the
-  same timestamp, thelatter ones will sort after the former ones.  We do this
+  collide with other IDs
+* they sort **lexicographically** (the timestamp is converted to a string
+  that will sort correctly)
+* they're monotonically increasing. Even if you generate more than one in the
+  same timestamp, the latter ones will sort after the former ones. We do this
   by using the previous random bits but "incrementing" them by 1 (only in the
   case of a timestamp collision).
 
@@ -24,3 +24,5 @@ Read https://www.firebase.com/blog/2015-02-11-firebase-unique-identifiers.html
 for more info.
 
 Based on https://gist.github.com/mikelehen/3596a30bd69384624c11
+
+You can read [Generating good, random and unique ids in Go](https://blog.kowalczyk.info/article/JyRZ/generating-good-random-and-unique-ids-in-go.html) to see how it compares to other similar libraries.

vendor/github.com/kjk/betterguid/betterguid.go

@@ -24,14 +24,17 @@ var (
 )
 
 func init() {
-	// have to seed to get randomness
+	// seed to get randomness
 	rnd = rand.New(rand.NewSource(time.Now().UnixNano()))
-	for i := 0; i < 12; i++ {
+}
+
+func genRandPart() {
+	for i := 0; i < len(lastRandChars); i++ {
 		lastRandChars[i] = rnd.Intn(64)
 	}
 }
 
-// New creates a new guid.
+// New creates a new random, unique id
 func New() string {
 	var id [8 + 12]byte
 	mu.Lock()
@@ -46,6 +49,8 @@ func New() string {
 			// increment the next byte
 			lastRandChars[i] = 0
 		}
+	} else {
+		genRandPart()
 	}
 	lastPushTimeMs = timeMs
 	// put random as the second part