fillup readme with asFlow info and add one more test

src/commonTest/kotlin/com/insanusmokrassar/krontab/utils/FailJob.kt

@@ -0,0 +1,8 @@
+package com.insanusmokrassar.krontab.utils
+
+import kotlinx.coroutines.*
+
+fun CoroutineScope.createFailJob(forTimeMillis: Long) = launch {
+    delay(forTimeMillis)
+    throw IllegalStateException("This job must be completed at before this exception happen")
+}

src/commonTest/kotlin/com/insanusmokrassar/krontab/utils/SchedulerFlow.kt

@@ -1,6 +1,7 @@
 package com.insanusmokrassar.krontab.utils
 
 import com.insanusmokrassar.krontab.builder.buildSchedule
+import com.soywiz.klock.DateTime
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.flow.takeWhile
@@ -31,4 +32,38 @@ class SchedulerFlowTests {
             assertEquals(mustBeCollected, collected)
         }
     }
+
+    @Test
+    fun testThatFlowIsCorrectlyWorkEverySecondWithMuchOfEmitters() {
+        val kronScheduler = buildSchedule {
+            seconds {
+                0 every 1
+            }
+        }
+
+        val flow = kronScheduler.asFlow()
+
+        runTest {
+            val testsCount = 10
+            val failJob = it.createFailJob((testsCount * 2) * 1000L)
+            val mustBeCollected = 10
+            val answers = (0 until testsCount).map { _ ->
+                it.async {
+                    var collected = 0
+                    flow.takeWhile {
+                        collected < mustBeCollected
+                    }.collect {
+                        collected++
+                    }
+                    collected
+                }
+            }.awaitAll()
+
+            failJob.cancel()
+
+            answers.forEach {
+                assertEquals(mustBeCollected, it)
+            }
+        }
+    }
 }