Change order of maven repositories in build.gradle

This will fix getting the dependency from smali. It seems like bintray
changed the status codes for missing dependencies, which cause the
lookup to fail.

Change-Id: I756efda9cda92e759d940a0bd344edadf3656fdb
diff --git a/build.gradle b/build.gradle
index 3385270..78d416c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -49,8 +49,8 @@
 
 repositories {
     maven { url 'https://maven.google.com' }
-    maven { url 'https://kotlin.bintray.com/kotlinx' }
     mavenCentral()
+    maven { url 'https://kotlin.bintray.com/kotlinx' }
 }
 
 if (project.hasProperty('with_code_coverage')) {