Update copyright year to 2019 in all the knit-generated files
diff --git a/reactive/kotlinx-coroutines-rx2/test/guide/example-reactive-operators-04.kt b/reactive/kotlinx-coroutines-rx2/test/guide/example-reactive-operators-04.kt
index bbc2e7b..c57e78f 100644
--- a/reactive/kotlinx-coroutines-rx2/test/guide/example-reactive-operators-04.kt
+++ b/reactive/kotlinx-coroutines-rx2/test/guide/example-reactive-operators-04.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ * Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
  */
 
 // This file was automatically generated from coroutines-guide-reactive.md by Knit tool. Do not edit.