[Android] Upgrade kotlinx to v0.22.2

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Thu Feb  8 15:42:47 2018 +0100| [297ffacd4ecc7ebe4701d63eb455ad600ea29181] | committer: Geoffrey Métais

Upgrade kotlinx to v0.22.2

> https://code.videolan.org/videolan/vlc-android/commit/297ffacd4ecc7ebe4701d63eb455ad600ea29181
---

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

diff --git a/build.gradle b/build.gradle
index 330cf4f21..bb942c143 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,7 +2,7 @@
 buildscript {
     ext.android_plugin_version = '3.0.1'
     ext.kotlin_version = '1.2.21'
-    ext.kotlinx_version = '0.21.2'
+    ext.kotlinx_version = '0.22.2'
     repositories {
         flatDir dirs: "gradle/plugins"
         google()