Replace JCenter with mavenCentral (#396)

Author: Baloo1

android/build.gradle

@@ -10,7 +10,7 @@ buildscript {
     }
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.2.1'
@@ -24,7 +24,7 @@ allprojects {
     repositories {
         mavenLocal()
         google()
-        jcenter()
+        mavenCentral()
         maven {
             // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
             url "$rootDir/../node_modules/react-native/android"

example/android/build.gradle

@@ -10,7 +10,7 @@ buildscript {
     }
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     dependencies {
         classpath("com.android.tools.build:gradle:4.1.0")
@@ -32,7 +32,6 @@ allprojects {
         }
 
         google()
-        jcenter()
-        maven { url 'https://www.jitpack.io' }
+        mavenCentral()
     }
 }