docs: bump version

cmd/tank/main.go

@@ -174,7 +174,7 @@ func cmdRunSa(c *cli.Context) error {
 func main() {
 	app := cli.NewApp()
 	app.Name = "tank"
-	app.Version = "1.0.0-alpha5"
+	app.Version = "1.0.0-alpha6"
 	app.Usage = "import & playlist daemon"
 	app.Flags = []cli.Flag{
 		cli.StringFlag{