bump SDK version

Examples/simple-fcm-client/android/app/build.gradle

@@ -84,13 +84,13 @@ def enableSeparateBuildPerCPUArchitecture = false
 def enableProguardInReleaseBuilds = false
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion "23.0.1"
+    compileSdkVersion 27
+    buildToolsVersion "27.0.3"
 
     defaultConfig {
         applicationId "com.google.firebase.quickstart.fcm"
         minSdkVersion 16
-        targetSdkVersion 26
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
         ndk {
@@ -133,7 +133,6 @@ android {
 dependencies {
     compile project(':react-native-fcm')
     compile fileTree(dir: "libs", include: ["*.jar"])
-    compile "com.android.support:appcompat-v7:26.1.0"
     compile "com.facebook.react:react-native:+"  // From node_modules
 }
 

Examples/simple-fcm-client/android/build.gradle

@@ -3,10 +3,14 @@
 buildscript {
     repositories {
         jcenter()
+        maven {
+            url 'https://maven.google.com/'
+            name 'Google'
+        }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
-        classpath 'com.google.gms:google-services:3.0.0'
+        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.google.gms:google-services:3.1.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -22,7 +26,8 @@ allprojects {
             url "$rootDir/../node_modules/react-native/android"
         }
         maven {
-            url "https://maven.google.com"
+            url 'https://maven.google.com/'
+            name 'Google'
         }
     }
 }

Examples/simple-fcm-client/android/gradle/wrapper/gradle-wrapper.properties

-#Fri Jan 06 16:34:59 EST 2017
+#Thu May 03 13:49:29 EDT 2018
 distributionBase=GRADLE_USER_HOME
 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-4.4-all.zip