Update README.md

Author: clipperhouse

README.md

@@ -10,14 +10,10 @@ go get github.com/clipperhouse/displaywidth
 
 ```go
 // StringWidth calculates the display width of a string
-// eastAsianWidth: when true, treat ambiguous width characters as wide (width 2)
-// strictEmojiNeutral: when true, use strict emoji width calculation (some emoji become width 1)
-func String(s string, eastAsianWidth bool, strictEmojiNeutral bool) int
+func String(s string) int
 
 // BytesWidth calculates the display width of a []byte
-// eastAsianWidth: when true, treat ambiguous width characters as wide (width 2)
-// strictEmojiNeutral: when true, use strict emoji width calculation (some emoji become width 1)
-func Bytes(s []byte, eastAsianWidth bool, strictEmojiNeutral bool) int
+func Bytes(s []byte) int
 ```
 
 ## Usage
@@ -32,15 +28,15 @@ import (
 
 func main() {
     // Basic usage
-    width := displaywidth.String("Hello, 世界!", false, false)
+    width := displaywidth.String("Hello, 世界!")
     fmt.Println(width) // Output: 13
 
     // With East Asian width mode
-    width = displaywidth.String("café", true, false)
+    width = displaywidth.String("café")
     fmt.Println(width) // Output: 4
 
     // Using BytesWidth
-    width = displaywidth.Bytes([]byte("🌍"), false, false)
+    width = displaywidth.Bytes([]byte("🌍"))
     fmt.Println(width) // Output: 2
 }
 ```
@@ -49,6 +45,9 @@ func main() {
 
 This package implements the Unicode East Asian Width standard (UAX #11) and is intended to be compatible with `go-runewidth` and `wcwidth`. It operates on bytes without decoding runes for better performance.
 
+There is also an `Options` type, to specify East Asian Width and Strict Emoji Neutral settings. If unspecified, the
+default is `EastAsianWidth: false, StrictEmojiNeutral: true`.
+
 ## Prior Art
 
 [mattn/go-runewidth](https://github.com/mattn/go-runewidth), which is excellent and popular.