Update build.gradle (react-native-image-picker#535)

Author: alexeypodolian

android/build.gradle

@@ -20,12 +20,12 @@ buildscript {
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.1"
+    compileSdkVersion 25
+    buildToolsVersion "25.0.2"
 
     defaultConfig {
         minSdkVersion 16
-        targetSdkVersion 23
+        targetSdkVersion 25
         versionCode 1
         versionName computeVersionName()
     }