[bundle][doc] drop unwanted docs from bundle.

DISTRO_README.md

@@ -33,7 +33,7 @@ without need to ship an additional execution runtime.
  See `README.md` in each sample directory for more information and build instructions.
 
  _Kotlin/Native_ could be used either as standalone compiler toolchain or as Gradle
-plugin. See `GRADLE_PLUGIN.md` for more details on how to use this plugin.
+plugin. See [`GRADLE_PLUGIN.md`](https://github.com/JetBrains/kotlin-native/blob/master/GRADLE_PLUGIN.md) for more details on how to use this plugin.
 
 Compile your programs like that:
 
@@ -49,6 +49,6 @@ To generate interoperability stubs create library definition file
 
     cinterop -def lib.def
  
-See `INTEROP.md` for more information on how to use C libraries from _Kotlin/Native_.
+See [`INTEROP.md`](https://github.com/JetBrains/kotlin-native/blob/master/INTEROP.md) for more information on how to use C libraries from _Kotlin/Native_.
 
 See `RELEASE_NOTES.md` for information on supported platforms and current limitations.

RELEASE_NOTES.md

@@ -41,7 +41,7 @@ To run _Kotlin/Native_ JDK 8 or Java 9 (JDK) for the host platform has to be ins
 
 On macOS it also requires Xcode 9.4.1 or newer to be installed.
 
-The language and library version supported by this EAP release mostly match Kotlin 1.2.60.
+The language and library version supported by this EAP release match Kotlin 1.3.
 However, there are certain limitations, see section [Known Limitations](#limitations).
 
  Currently _Kotlin/Native_ uses reference counting based memory management scheme with a cycle

build.gradle

@@ -383,10 +383,7 @@ task bundle(type: (isWindows()) ? Zip : Tar) {
         into baseName
     }
     from(project.rootDir) {
-        include 'INTEROP.md'
         include 'RELEASE_NOTES.md'
-        include 'GRADLE_PLUGIN.md'
-        include 'PLATFORM_LIBS.md'
         include 'samples/**'
         exclude '**/gradle.properties'
         exclude '**/settings.gradle'