c:\Users\lenger\Desktop\webrowser>git diff android/build.gradle

diff --git a/android/build.gradle b/android/build.gradle
index eed9972..c5fecab 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:3.0.1'

         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

warning

c:\Users\lenger\Desktop\webrowser>git diff android/app/build.gradle

diff --git a/android/app/build.gradle b/android/app/build.gradle
index b589c49..b20457c 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -95,7 +95,6 @@ def enableProguardInReleaseBuilds = false

 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.1"

     defaultConfig {
         applicationId "com.webrowser"

react-native run-android : buildToolsVersion "23.0.1" is ignored