Merge pull request #104 from AgoraIO/LichKing-2234-patch-1

build: remove `mavenCentral` from `build.gradle`

Author: plutoless

Android/APIExample/build.gradle

@@ -2,7 +2,6 @@
 
 buildscript {
     repositories {
-        mavenCentral()
         google()
         jcenter()
 
@@ -19,7 +18,6 @@ buildscript {
 
 allprojects {
     repositories {
-        mavenCentral()
         google()
         jcenter()
     }