replace IllegalArgumentException with require

src/commonMain/kotlin/com/infendro/random/prng/PRNG.kt

@@ -15,11 +15,9 @@ abstract class PRNG : Random() {
     override fun nextBits(
         bitCount: Int,
     ): Int {
-        if (bitCount !in 0..32)
-            throw IllegalArgumentException()
-        if (bitCount == 0)
-            return 0
+        require(bitCount in 0..32)
 
+        if (bitCount == 0) return 0
         return generate(4).toInt() ushr (32 - bitCount)
     }
 
@@ -28,10 +26,8 @@ abstract class PRNG : Random() {
         fromIndex: Int,
         toIndex: Int,
     ): ByteArray {
-        if (fromIndex !in 0..array.size || toIndex !in 0..array.size)
-            throw IllegalArgumentException()
-        if (fromIndex > toIndex)
-            throw IllegalArgumentException()
+        require(fromIndex in 0..array.size && toIndex in 0..array.size)
+        require(fromIndex <= toIndex)
 
         val size = toIndex - fromIndex
         val bytes = generate(size).asByteArray()