[Android] Fix gradle and plugin versions with Android Studio 3.0 Beta 4

android/build.gradle

@@ -7,7 +7,7 @@ buildscript {
         maven { url 'https://maven.google.com' }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.0-beta2'
+        classpath 'com.android.tools.build:gradle:3.0.0-beta4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files.

android/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Tue Aug 08 14:17:48 CDT 2017
+#Fri Sep 08 10:42:14 CEST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-rc-1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip