Chapter 5: Update Kotlin version 1.3.61 to 1.3.7

[viartemev]

Chapter 5 has code examples with Kotlin coroutines that don't work (Intro.kt, at least).
There is a stacktrace:

Exception in thread "main" java.lang.NoClassDefFoundError: kotlin/coroutines/AbstractCoroutineContextKey
	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
	at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
	at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:825)
	at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:723)
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:646)
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:604)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	at kotlinx.coroutines.CoroutineDispatcher.<clinit>(CoroutineDispatcher.kt)
	at kotlinx.coroutines.EventLoopKt.createEventLoop(EventLoop.kt:26)
	at kotlinx.coroutines.ThreadLocalEventLoop.getEventLoop$kotlinx_coroutines_core(EventLoop.common.kt:126)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:48)
	at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:38)
	at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)
	at chapter5.kotlin.coroutines.intro.IntroKt.main(Intro.kt:8)
	at chapter5.kotlin.coroutines.intro.IntroKt.main(Intro.kt)
Caused by: java.lang.ClassNotFoundException: kotlin.coroutines.AbstractCoroutineContextKey
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	... 18 more

The problem can be fixed by updating Kotlin version.
A similar issue in Kotlin Github: Kotlin/kotlinx.coroutines#1879