Fix example app Android build (#827)

Author: a7medev

example/android/build.gradle

@@ -41,7 +41,15 @@ buildscript {
     }
 }
 
+def REACT_NATIVE_VERSION = new File(['node', '--print',"JSON.parse(require('fs').readFileSync(require.resolve('react-native/package.json'), 'utf-8')).version"].execute(null, rootDir).text.trim())
+
 allprojects {
+    configurations.all {
+        resolutionStrategy {
+            force "com.facebook.react:react-native:" + REACT_NATIVE_VERSION
+        }
+    }
+
     repositories {
         mavenCentral()
         mavenLocal()