[Android] Upgrade Kotlin

[Geoffrey Métais]

vlc-android | branch: 3.0.x | Geoffrey Métais <geoffrey.metais at gmail.com> | Fri Apr 13 10:12:43 2018 +0200| [b10c3c714a9800a6d3d3e2f3b0840c9c4efe8e42] | committer: Geoffrey Métais

Upgrade Kotlin

> https://code.videolan.org/videolan/vlc-android/commit/b10c3c714a9800a6d3d3e2f3b0840c9c4efe8e42
---

 build.gradle | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build.gradle b/build.gradle
index 997c02706..ea30dbfde 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     ext.android_plugin_version = '3.0.1'
-    ext.kotlin_version = '1.2.21'
+    ext.kotlin_version = '1.2.31'
     ext.kotlinx_version = '0.22.2'
     repositories {
         flatDir dirs: "gradle/plugins"