[Android] Upgrade Kotlin

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Tue Aug  7 10:44:05 2018 +0200| [d2e50e7716ce78736a70033ba0b96645491b1cb4] | committer: Geoffrey Métais

Upgrade Kotlin

> https://code.videolan.org/videolan/vlc-android/commit/d2e50e7716ce78736a70033ba0b96645491b1cb4
---

 build.gradle | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/build.gradle b/build.gradle
index ce9c6ea6c..aeb26aef7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,8 +1,8 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     ext.android_plugin_version = '3.1.4'
-    ext.kotlin_version = '1.2.51'
-    ext.kotlinx_version = '0.23.3'
+    ext.kotlin_version = '1.2.60'
+    ext.kotlinx_version = '0.24.0'
     repositories {
         flatDir dirs: "gradle/plugins"
         google()