replace IllegalArgumentException with require

bump version

README.md

@@ -25,7 +25,7 @@ repositories {
 }
 
 dependencies {
-    implementation("com.infendro:otp:1.2.1")
+    implementation("com.infendro:otp:1.2.2")
 }
 ```
 

src/commonMain/kotlin/com/infendro/otp/HOTP.kt

@@ -25,8 +25,7 @@ class HOTP(
         secret: UByteArray,
         counter: Long,
     ): String {
-        if (counter < 0)
-            throw IllegalArgumentException()
+        require(counter >= 0)
 
         val hash = generateHash(secret, counter.toUByteArray())
         return otp(hash)