title: Failed to resolve Firebase 11.2.0 version
body: <p>I am constantly getting this issue.
  Android Studio is not resolving <strong>11.2.0</strong> latest version of <strong>Firebase</strong>.</p>
  
  <p>This is my root level gradle,</p>
  
  <pre><code>   /* Top-level build file where you can add configuration options common to all sub-projects/modules.*/
  
  buildscript {
  
      repositories {
          jcenter{
              url 'http://jcenter.bintray.com'
          }
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:2.3.3'
          classpath 'com.google.gms:google-services:3.1.0'
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          jcenter()
          maven {
              url "https://maven.google.com"
          }
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <p>And app gradle is,</p>
  
  <pre><code>    apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 26
      buildToolsVersion "26.0.1"
      defaultConfig {
          applicationId "com.cognisun.fcmdemo"
          minSdkVersion 23
          targetSdkVersion 26
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
  
      compile 'com.android.support:appcompat-v7:26.+'
      compile 'com.android.support.constraint:constraint-layout:1.0.2'
      compile 'com.android.support:design:26.+'
  
      compile 'com.google.android.gms:play-services:11.2.0'
      compile 'com.google.firebase:firebase-core:11.2.0'
  }
  apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p>I have downloaded every essential sdk files and also followed <a href="https://stackoverflow.com/questions/45696551/failed-to-resolve-com-google-firebasefirebase-core11-2-0">this</a> link.</p>
  
  <p>Even why I am doing wrong.
  Any suggestions guys</p>