add support of ranges in strings

src/commonMain/kotlin/com/insanusmokrassar/krontab/builder/TimeBuilder.kt

@@ -81,6 +81,16 @@ sealed class TimeBuilder (
      */
     @Suppress("unused")
     infix fun upTo(endIncluding: Int): Array<Int> = this from 0 upTo endIncluding
+    /**
+     * Will fill up this timeline from [this] up to [endIncluding]
+     */
+    @Suppress("MemberVisibilityCanBePrivate")
+    infix operator fun Int.rangeTo(endIncluding: Int) = upTo(endIncluding)
+    /**
+     * Shortcut for "[from] 0 [rangeTo] [endIncluding]"
+     */
+    @Suppress("MemberVisibilityCanBePrivate")
+    infix operator fun rangeTo(endIncluding: Int) = (this from 0) rangeTo endIncluding
 
     internal fun build() = result ?.map { it.toByte() } ?.toTypedArray()
 }

src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/Parser.kt

@@ -7,6 +7,10 @@ private fun createSimpleScheduler(from: String, dataRange: IntRange): Array<Byte
 
     val results = things.flatMap {
         when {
+            it.contains("-") -> {
+                val splitted = it.split("-")
+                (splitted.first().toInt().clamp(dataRange) .. splitted[1].toInt().clamp(dataRange)).toList()
+            }
             it.contains("/") -> {
                 val (start, step) = it.split("/")
                 val startNum = (if (start.isEmpty() || start == "*") {