Update readme

Author: yannh

Readme.md

@@ -31,6 +31,8 @@ Usage of ./bin/redis-dump-go:
         Server host (default "127.0.0.1")
   -n int
         Parallel workers (default 10)
+  -noscan
+        Use KEYS * instead of SCAN - for Redis <=2.8
   -output string
         Output type - can be resp or commands (default "resp")
   -port int
@@ -43,7 +45,7 @@ Database 0: 9 element dumped
 Database 1: 1 element dumped
 ```
 
-For password-protected Redis servers, set the shell variable REDISDUMPGO_AUTH:
+For password-protected Redis servers, set the shell variable REDISDUMPGO\_AUTH:
 
 ```
 $ export REDISDUMPGO_AUTH=myRedisPassword

main.go

@@ -51,8 +51,8 @@ func realMain() int {
 	host := flag.String("host", "127.0.0.1", "Server host")
 	port := flag.Int("port", 6379, "Server port")
 	db := flag.Uint("db", 0, "only dump this database (default: all databases)")
-	filter := flag.String("filter", "*", "key filter to use")
-	noscan := flag.Bool("noscan", false, "use KEYS * instead of SCAN - for Redis <=2.8")
+	filter := flag.String("filter", "*", "Key filter to use")
+	noscan := flag.Bool("noscan", false, "Use KEYS * instead of SCAN - for Redis <=2.8")
 	nWorkers := flag.Int("n", 10, "Parallel workers")
 	withTTL := flag.Bool("ttl", true, "Preserve Keys TTL")
 	output := flag.String("output", "resp", "Output type - can be resp or commands")