update readme (#2)

README.md

@@ -5,9 +5,9 @@ Binary Canonical Serialization (bcs) for Golang.
 [![Go Reference](https://pkg.go.dev/badge/github.com/fardream/go-bcs.svg)](https://pkg.go.dev/github.com/fardream/go-bcs)
 
 Binary Canonical Serialization (bcs) or Libra Canonical Serialization (lcs) is developed
-for the shuttlered [libra/diem](https://www.diem.com/) blockchain project.
+for the shuttered [libra/diem](https://www.diem.com/) blockchain project.
 
-Its target is mainly rust-lang struct, although many [move-lang](https://github.com/move-language/move) based
+BCS target is mainly rust-lang struct, although many [move-lang](https://github.com/move-language/move) based
 blockchains use it as serialization format.
 
-Given its root in rust, bcs include many structs are unavailable in golang (or move-lang), such as enum, option. See [go package website](https://pkg.go.dev/github.com/fardream/go-bcs) for more details.
+Given its root in rust, bcs include many features unavailable in golang (or move-lang), such as enum, option. See [go package website](https://pkg.go.dev/github.com/fardream/go-bcs) for more details.

bcs/tag.go

@@ -5,9 +5,7 @@ import (
 	"strings"
 )
 
-const (
-	tagName = "bcs"
-)
+const tagName = "bcs"
 
 const (
 	tagValue_Optional int64 = 1 << iota // optional

bcs/unmarshaler.go

@@ -5,7 +5,7 @@ import "io"
 // Unmarshaler customizes the unmarshalling behavior for a type.
 //
 // Compared with other Unmarshalers in golang, the Unmarshaler here takes
-// a [io.Reader] instead of []byte, since it is difficult to delimit the byte streams.
+// a [io.Reader] instead of []byte, since it is difficult to delimit the byte streams without unmarshalling.
 type Unmarshaler interface {
 	UnmarshalBCS(io.Reader) (int, error)
 }