title: Failed to resolve: firebase-storage-15.0.0
body: <p>When I add Firebase to my application it shows this error:</p>
  
  <blockquote>
    <p>Failed to resolve: 'firebase-storage-15.0.0'</p>
  </blockquote>
  
  <p>And an error on this line: <code>com.android.support:appcompat-v7:28.0.0</code></p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 28
      defaultConfig {
          applicationId "com.rud.younis.csedepertment"
          minSdkVersion 19
          targetSdkVersion 28
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation 'com.android.support:appcompat-v7:28.0.0'
      implementation 'com.android.support:design:28.0.0'
      implementation 'com.android.support.constraint:constraint-layout:1.1.3'
      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'com.android.support.test:runner:1.0.2'
      androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
      implementation 'com.google.firebase:firebase-core:16.0.1'
      implementation 'com.google.firebase:firebase-storage:16.0.1:15.0.0'
      implementation 'com.google.firebase:firebase-auth:16.0.1:15.0.0'
      implementation 'com.google.firebase:firebase-database:16.0.1:15.0.0'
  
  }
  
  apply plugin: 'com.google.gms.google-services'
  </code></pre>