Update README.md

README.md

@@ -8,11 +8,11 @@ fmt.Print(s) // output: mUNERA9rI2
 
 
 // Letters is source of generated random string.(Default: A~Z & a~z & 0~9)
-randstr.Letters = []rune("グレープフルーツ最高！！あとマンゴーも！！")
+randstr.SetSrcLetters([]rune("グレープフルーツ最高！！あとマンゴーも！！"))
 s = randstr.Gen(6)
 fmt.Print(s) // output: あ高ツフマレ
 
-randstr.Letters = []rune(randstr.StrLettersNum + randstr.StrLettersUpper)
+randstr.SetSrcLetters([]rune(randstr.LettersNumStr + randstr.LettersUpperStr))
 s = randstr.Gen(8)
 fmt.Print(s) // output: IIDAZG7H
 
@@ -24,7 +24,7 @@ randstr.GetRandModule().Seed(47)
 // new RandStr
 rs := randstr.New(
 	rand.NewSource(2003),
-	[]rune(randstr.StrLettersNum+"+-*/"),
+	[]rune(randstr.LettersNumStr+"+-*/"),
 )
 s = rs.Gen(16)
 fmt.Print(s) // output: 587466+2343008+8