some readme updates

Author: Piotr

README.md

@@ -149,6 +149,7 @@ Flags:
   -n, --no-analytics                  Opt-out from sending anonymous analytical data that helps improve Logdy
   -u, --no-updates                    Opt-out from checking updates on program startup
   -p, --port string                   Port on which the Web UI will be served (default "8080")
+      --rotate-file-size string       If set, how big the file can grow before being rotated, used K/M/G to describe the size, example: 15M -> 15 megabytes (env: LOGDY_ROTATE_FILE_SIZE)
       --ui-ip string                  Bind Web UI server to a specific IP address (default "127.0.0.1")
       --ui-pass string                Password that will be used to authenticate in the UI
   -v, --verbose                       Verbose logs

http/client.go

@@ -1,6 +1,7 @@
 package http
 
 import (
+	"fmt"
 	"sync"
 	"time"
 
@@ -353,7 +354,7 @@ func InitializeClients(config Config) *ClientsStruct {
 		bts, err = utils.ParseRotateSize(config.AppendToFileRotateMaxSize)
 
 		if err != nil {
-			panic(err)
+			panic(fmt.Errorf("file rotate size parse error: %w", err))
 		}
 	}