Update copyrights in kotlin.test library

Change line number in StackTraceJVMTest due to the added copyright

libraries/kotlin.test/junit/src/main/kotlin/Annotations.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the license/LICENSE.txt file.
  */
 

libraries/kotlin.test/junit/src/main/kotlin/JUnitSupport.kt

@@ -1,3 +1,8 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
 package kotlin.test.junit
 
 import org.junit.*

libraries/kotlin.test/junit/src/test/kotlin/JUnitContributorTest.kt

@@ -1,3 +1,8 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
 package kotlin.test.junit.tests
 
 import org.junit.Assert