example is sha256 not sha1

Author: dominictarr

README.md

@@ -14,7 +14,7 @@ var createHash = require('sha.js')
 var sha256 = createHash('sha256')
 var sha512 = createHash('sha512')
 
-var h = sha1.update('abc', 'utf8').digest('hex')
+var h = sha256.update('abc', 'utf8').digest('hex')
 console.log(h) //ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad
 
 //LEGACY, do not use in new systems: