Merge pull request #256 from rghorbani/master

Upgrade SDK Build Tools for react-native 0.56.0

Author: fractalwrench

android/build.gradle

@@ -1,12 +1,16 @@
 apply plugin: 'com.android.library'
 
+def safeExtGet(prop, fallback) {
+    rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+}
+
 android {
-    buildToolsVersion '23.0.1'
-    compileSdkVersion 23
+    buildToolsVersion safeExtGet('buildToolsVersion', '26.0.3')
+    compileSdkVersion safeExtGet('compileSdkVersion', 26)
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 23
+        minSdkVersion safeExtGet('minSdkVersion', 16)
+        targetSdkVersion safeExtGet('targetSdkVersion', 26)
         versionCode 4
         versionName '2.10.0'
     }

android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.5.1-all.zip