update android build config for newer react-native versions

android/build.gradle

 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:3.1.4'
     }
 }
 
 }
 
 dependencies {
-    compile "com.facebook.react:react-native:${safeExtGet('reactNativeVersion', '+')}"
+    implementation "com.facebook.react:react-native:${safeExtGet('reactNativeVersion', '+')}"
     //compile 'com.squareup.okhttp3:okhttp:+'
     //{RNFetchBlob_PRE_0.28_DEPDENDENCY}
 }

android/gradle/wrapper/gradle-wrapper.properties

 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-bin.zip