kotlinx-coroutines-io module removed, it has moved to kotlinx.io

See https://github.com/kotlin/kotlinx-io/

Author: elizarov

benchmarks/build.gradle

@@ -15,7 +15,6 @@ dependencies {
     jmh project(':kotlinx-coroutines-core-common')
     jmh project(':kotlinx-coroutines-core')
     jmh project(':kotlinx-coroutines-core').sourceSets.test.output
-    jmh project(':kotlinx-coroutines-io')
 }
 
 jmh.jmhVersion = '1.19'

binary-compatibility-validator/build.gradle

@@ -11,9 +11,8 @@ dependencies {
     compile 'com.google.code.gson:gson:2.6.2'
 
     testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
+    
     testArtifacts project(':kotlinx-coroutines-core')
-    testArtifacts project(':kotlinx-coroutines-io')
-
 
     testArtifacts project(':kotlinx-coroutines-reactive')
     testArtifacts project(':kotlinx-coroutines-reactor')

core/README.md

@@ -6,5 +6,4 @@ Module name below corresponds to the artifact name in Maven/Gradle.
 ## Modules
 
 * [kotlinx-coroutines-core](kotlinx-coroutines-core/README.md) -- core coroutine builders and synchronization primitives. 
-* [kotlinx-coroutines-io](kotlinx-coroutines-io/README.md) -- byte I/O channels (_unstable_, work in progress).