Update property extension (#143)

TommyLeong · christopherdro · commit 7c1d9f3dd6d0 · 2019-11-13T14:36:42.000-08:00
diff --git a/android/build.gradle b/android/build.gradle
@@ -1,6 +1,6 @@
 
 buildscript {
-     ext {
+     rootProject.ext {
         buildToolsVersion = "28.0.3"
         minSdkVersion = 16
         compileSdkVersion = 28
