Update vendor

vendor/github.com/labstack/gommon/random/random.go

@@ -0,0 +1,52 @@
+package random
+
+import (
+	"math/rand"
+	"time"
+)
+
+type (
+	Random struct {
+		charset Charset
+	}
+
+	Charset string
+)
+
+const (
+	Alphanumeric Charset = Alphabetic + Numeric
+	Alphabetic   Charset = "abcdefghijklmnopqrstuvwxyz" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	Numeric      Charset = "0123456789"
+	Hex          Charset = Numeric + "abcdef"
+)
+
+var (
+	global = New()
+)
+
+func New() *Random {
+	rand.Seed(time.Now().UnixNano())
+	return &Random{
+		charset: Alphanumeric,
+	}
+}
+
+func (r *Random) SetCharset(c Charset) {
+	r.charset = c
+}
+
+func (r *Random) String(length uint8) string {
+	b := make([]byte, length)
+	for i := range b {
+		b[i] = r.charset[rand.Int63()%int64(len(r.charset))]
+	}
+	return string(b)
+}
+
+func SetCharset(c Charset) {
+	global.SetCharset(c)
+}
+
+func String(length uint8) string {
+	return global.String(length)
+}