upgrade gradle

app/build.gradle

@@ -5,6 +5,7 @@ buildscript {
     }
 
     repositories {
+        google()
         jcenter()
         maven { url 'https://maven.fabric.io/public' }
     }
@@ -31,7 +32,7 @@ apply plugin: 'com.cookpad.android.licensetools'
 
 android {
     compileSdkVersion 26
-    buildToolsVersion "26.0.2"
+    buildToolsVersion '27.0.3'
     defaultConfig {
         applicationId "com.bl_lia.kirakiratter"
         minSdkVersion 19
@@ -135,13 +136,10 @@ dependencies {
     })
 }
 repositories {
+    google()
     mavenCentral()
     maven { url 'https://maven.fabric.io/public' }
     maven { url "https://jitpack.io" }
-    maven {
-        url 'https://maven.google.com/'
-        name 'Google'
-    }
 }
 
 apply plugin: 'com.google.gms.google-services'

build.gradle

@@ -3,11 +3,11 @@
 buildscript {
     ext.kotlin_version = '1.1.51'
     repositories {
-        jcenter()
         google()
+        jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.0'
+        classpath 'com.android.tools.build:gradle:3.1.3'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "io.realm:realm-gradle-plugin:3.1.2"
         classpath 'com.google.gms:google-services:3.1.0'
@@ -20,6 +20,7 @@ buildscript {
 
 allprojects {
     repositories {
+        google()
         jcenter()
         maven {
             url "https://maven.google.com" // Google's Maven repository

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Sat Oct 28 11:00:24 JST 2017
+#Sun Jun 17 11:39:40 JST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip